Copy and merge the existing dep scan docs to a new location

Merge the following docs into one:

- https://docs.gitlab.com/ee/user/project/merge_requests/dependency_scanning.html
- https://docs.gitlab.com/ee/ci/examples/dependency_scanning.html

doc/user/security/dependency_scanning/index.md

+# Dependency Scanning **[ULTIMATE]**
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/issues/5105)
+in [GitLab Ultimate](https://about.gitlab.com/pricing/) 10.7.
+
+## Overview
+
+If you are using [GitLab CI/CD](../../../ci/README.md), you can analyze your dependencies for known
+vulnerabilities using Dependency Scanning.
+
+You can take advantage of Dependency Scanning by either [including the CI job](../../../ci/examples/dependency_scanning.md) in
+your existing `.gitlab-ci.yml` file or by implicitly using
+[Auto Dependency Scanning](../../../topics/autodevops/index.md#auto-dependency-scanning-ultimate)
+that is provided by [Auto DevOps](../../../topics/autodevops/index.md).
+
+GitLab checks the Dependency Scanning report, compares the found vulnerabilities
+between the source and target branches, and shows the information right on the
+merge request.
+
+![Dependency Scanning Widget](img/dependency_scanning.png)
+
+The results are sorted by the priority of the vulnerability:
+
+1. High
+1. Medium
+1. Low
+1. Unknown
+1. Everything else
+
+## Use cases
+
+It helps to automatically find security vulnerabilities in your dependencies
+while you are developing and testing your applications. For example when your
+application is using an external (open source) library which is known to be vulnerable.
+
+## Requirements
+
+To run a Dependency Scanning job, you need GitLab Runner with the
+[`docker`](https://docs.gitlab.com/runner/executors/docker.html#use-docker-in-docker-with-privileged-mode) or
+[`kubernetes`](https://docs.gitlab.com/runner/install/kubernetes.html#running-privileged-containers-for-the-runners)
+executor running in privileged mode. If you're using the shared Runners on GitLab.com,
+this is enabled by default.
+
+## Supported languages and package managers
+
+The following languages and dependency managers are supported.
+
+| Language (package managers)                                                 | Scan tool                                                                                                                         |
+|-----------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------|
+| JavaScript ([npm](https://www.npmjs.com/), [yarn](https://yarnpkg.com/en/)) | [gemnasium](https://gitlab.com/gitlab-org/security-products/gemnasium/general), [Retire.js](https://retirejs.github.io/retire.js)         |
+| Python ([pip](https://pip.pypa.io/en/stable/)) (only `requirements.txt` supported)  | [gemnasium](https://gitlab.com/gitlab-org/security-products/gemnasium/general)                                                            |
+| Ruby ([gem](https://rubygems.org/))                                         | [gemnasium](https://gitlab.com/gitlab-org/security-products/gemnasium/general), [bundler-audit](https://github.com/rubysec/bundler-audit) |
+| Java ([Maven](https://maven.apache.org/))                                   | [gemnasium](https://gitlab.com/gitlab-org/security-products/gemnasium/general)                                                            |
+| PHP ([Composer](https://getcomposer.org/))                                  | [gemnasium](https://gitlab.com/gitlab-org/security-products/gemnasium/general)                                                            |
+
+Some scanners require to send a list of project dependencies to GitLab's central
+servers to check for vulnerabilities. To learn more about this or to disable it,
+refer to the [GitLab Dependency Scanning tool documentation](https://gitlab.com/gitlab-org/security-products/dependency-scanning#remote-checks).
+
+## Configuring Dependency Scanning
+
+To enable Dependency Scanning in your project, define a job in your `.gitlab-ci.yml`
+file that generates the
+[Dependency Scanning report artifact](../../../ci/yaml/README.md#artifactsreportsdependency_scanning-ultimate).
+
+This can be done in two ways:
+
+- For GitLab 11.9 and later, including the provided Dependency Scanning
+  `.gitlab-ci.yml` template (recommended).
+- Manually specifying the job definition. Not recommended unless using GitLab
+  11.8 and earlier.
+
+### Including the provided template
+
+NOTE: **Note:**
+The CI/CD Dependency Scanning template is supported on GitLab 11.9 and later versions.
+For earlier versions, use the [manual job definition](#manual-job-definition-for-gitlab-115-and-later).
+
+A CI/CD [Dependency Scanning template](https://gitlab.com/gitlab-org/gitlab-ee/blob/master/lib/gitlab/ci/templates/Security/Dependency-Scanning.gitlab-ci.yml)
+with the default Dependency Scanning job definition is provided as a part of your GitLab
+installation which you can [include](../../../ci/yaml/README.md#includetemplate)
+in your `.gitlab-ci.yml` file.
+
+To enable Dependency Scanning using the provided template, add the following to
+your `.gitlab-ci.yml` file:
+
+```yaml
+include:
+  template: Dependency-Scanning.gitlab-ci.yml
+```
+
+The included template will create a `dependency_scanning` job in your CI/CD
+pipeline and scan your project's source code for possible vulnerabilities.
+
+The report will be saved as a
+[Dependency Scanning report artifact](../../../ci/yaml/README.md#artifactsreportsdependency_scanning-ultimate)
+that you can later download and analyze. Due to implementation limitations, we
+always take the latest Dependency Scanning artifact available.
+
+Some security scanners require to send a list of project dependencies to GitLab
+central servers to check for vulnerabilities. To learn more about this or to
+disable it, check the
+[GitLab Dependency Scanning tool documentation](https://gitlab.com/gitlab-org/security-products/dependency-scanning#remote-checks).
+
+#### Customizing the Dependency Scanning settings
+
+The Dependency Scanning settings can be changed through environment variables by using the
+[`variables`](../../../ci/yaml/README.md#variables) parameter in `.gitlab-ci.yml`.
+These variables are documented in the
+[Dependency Scanning tool documentation](https://gitlab.com/gitlab-org/security-products/dependency-scanning#settings).
+
+For example:
+
+```yaml
+include:
+  template: Dependency-Scanning.gitlab-ci.yml
+
+variables:
+  DEP_SCAN_DISABLE_REMOTE_CHECKS: true
+```
+
+Because template is [evaluated before](../../../ci/yaml/README.md#include) the pipeline
+configuration, the last mention of the variable will take precedence.
+
+#### Overriding the Dependency Scanning template
+
+If you want to override the job definition (for example, change properties like
+`variables` or `dependencies`), you need to declare a `dependency_scanning` job
+after the template inclusion and specify any additional keys under it. For example:
+
+```yaml
+include:
+  template: Dependency-Scanning.gitlab-ci.yml
+
+dependency_scanning:
+  variables:
+    CI_DEBUG_TRACE: "true"
+```
+
+### Manual job definition for GitLab 11.5 and later
+
+For GitLab 11.5 and GitLab Runner 11.5 and later, the following `dependency_scanning`
+job can be added:
+
+```yaml
+dependency_scanning:
+  image: docker:stable
+  variables:
+    DOCKER_DRIVER: overlay2
+  allow_failure: true
+  services:
+    - docker:stable-dind
+  script:
+    - export DS_VERSION=${SP_VERSION:-$(echo "$CI_SERVER_VERSION" | sed 's/^\([0-9]*\)\.\([0-9]*\).*/\1-\2-stable/')}
+    - |
+      docker run \
+      --env DS_ANALYZER_IMAGES \
+      --env DS_ANALYZER_IMAGE_PREFIX \
+      --env DS_ANALYZER_IMAGE_TAG \
+      --env DS_DEFAULT_ANALYZERS \
+      --env DEP_SCAN_DISABLE_REMOTE_CHECKS \
+      --env DS_DOCKER_CLIENT_NEGOTIATION_TIMEOUT \
+      --env DS_PULL_ANALYZER_IMAGE_TIMEOUT \
+      --env DS_RUN_ANALYZER_TIMEOUT \
+      --volume "$PWD:/code" \
+      --volume /var/run/docker.sock:/var/run/docker.sock \
+      "registry.gitlab.com/gitlab-org/security-products/dependency-scanning:$DS_VERSION" /code
+  dependencies: []
+  artifacts:
+    reports:
+      dependency_scanning: gl-dependency-scanning-report.json
+```
+
+You can supply many other [settings variables](https://gitlab.com/gitlab-org/security-products/dependency-scanning#settings)
+via `docker run --env` to customize your job execution.
+
+### Manual job definition for GitLab 11.4 and earlier (deprecated)
+
+CAUTION: **Caution:**
+Before GitLab 11.5, the Dependency Scanning job and artifact had to be named specifically
+to automatically extract the report data and show it in the merge request widget.
+While these old job definitions are still maintained, they have been deprecated
+and may be removed in the next major release, GitLab 12.0. You are strongly advised
+to update your current `.gitlab-ci.yml` configuration to reflect that change.
+
+For GitLab 11.4 and earlier, the job should look like:
+
+```yaml
+dependency_scanning:
+  image: docker:stable
+  variables:
+    DOCKER_DRIVER: overlay2
+  allow_failure: true
+  services:
+    - docker:stable-dind
+  script:
+    - export DS_VERSION=${SP_VERSION:-$(echo "$CI_SERVER_VERSION" | sed 's/^\([0-9]*\)\.\([0-9]*\).*/\1-\2-stable/')}
+    - |
+      docker run \
+      --env DS_ANALYZER_IMAGES \
+      --env DS_ANALYZER_IMAGE_PREFIX \
+      --env DS_ANALYZER_IMAGE_TAG \
+      --env DS_DEFAULT_ANALYZERS \
+      --env DEP_SCAN_DISABLE_REMOTE_CHECKS \
+      --env DS_DOCKER_CLIENT_NEGOTIATION_TIMEOUT \
+      --env DS_PULL_ANALYZER_IMAGE_TIMEOUT \
+      --env DS_RUN_ANALYZER_TIMEOUT \
+      --volume "$PWD:/code" \
+      --volume /var/run/docker.sock:/var/run/docker.sock \
+      "registry.gitlab.com/gitlab-org/security-products/dependency-scanning:$DS_VERSION" /code
+  artifacts:
+    paths: [gl-dependency-scanning-report.json]
+```

doc/user/security/index.md

@@ -14,9 +14,9 @@ The following documentation relates to the DevOps **Secure** stage:
 
 | Secure topics                                                                                   | Description                                                            |
 |:------------------------------------------------------------------------------------------------|:-----------------------------------------------------------------------|
-| [Container Scanning](container_scanning/index.md) **[ULTIMATE]**            | Use Clair to scan docker images for known vulnerabilities.             |
-| [Dependency Scanning](../project/merge_requests/dependency_scanning.md) **[ULTIMATE]**          | Analyze your dependencies for known vulnerabilities.                   |
-| [Dynamic Application Security Testing (DAST)](dast/index.md) **[ULTIMATE]** | Analyze running web applications for known vulnerabilities.            |
+| [Container Scanning](container_scanning/index.md) **[ULTIMATE]**                                | Use Clair to scan docker images for known vulnerabilities.             |
+| [Dependency Scanning](dependency_scanning/index.md) **[ULTIMATE]**                              | Analyze your dependencies for known vulnerabilities.                   |
+| [Dynamic Application Security Testing (DAST)](dast/index.md) **[ULTIMATE]**                     | Analyze running web applications for known vulnerabilities.            |
 | [Group Security Dashboard](../group/security_dashboard/index.md) **[ULTIMATE]**                 | View vulnerabilities in all the projects in a group and its subgroups. |
 | [License Management](../project/merge_requests/license_management.md) **[ULTIMATE]**            | Search your project's dependencies for their licenses.                 |
 | [Project Security Dashboard](../project/security_dashboard.md) **[ULTIMATE]**                   | View the latest security reports for your project.                     |