Docs: update Pages documentation

See merge request gitlab-org/gitlab!19436

- Move getting started content to own docs
- Simplify index's getting started
- Move access control to its own doc
- Rewording for clarity
- Remove redundancies

Embedding Grafana metrics panels in GFM

See merge request gitlab-org/gitlab!18285

Adds filters for supporting the ability to embed Grafana metrics
in GitLab Flavored Markdown. Adds a filter which identifies
references in GFM to the domain corresponding to a configured
GrafanaIntegration for the project.

Note: This is only available for Prometheus datasources which are
configured to be proxied through Grafana.

Better document how to enable Auto Monitoring

Closes #31709

See merge request gitlab-org/gitlab!18949

- Mention the GitLab managed apps in the requirements of Auto DevOps
- Move the applications info in one place
- Be explicit what needs to be done to get Auto Monitoring working

Fix broken formatting of notification buttons

Closes #31893

See merge request gitlab-org/gitlab!16672

Backfill GraphQL field descriptions - part 1

See merge request gitlab-org/gitlab!19233

- Some use API docs copy-pasted material (a smell)
- Some are really obvious (e.g. "user's name"
- Some use labels from the UI

Resolve "Rename cluster_metrics_new.yml"

Closes #14740

See merge request gitlab-org/gitlab!19243

Fix 404 for usage question mark link

See merge request gitlab-org/gitlab!19340

Migrate pipelines specs to Jest & VTU

See merge request gitlab-org/gitlab!19270

Improve frontend codeowners and roulette for Eng. productivity

See merge request gitlab-org/gitlab!19076

Reduce redundancy and move source/target branch selectors to top of MR view

See merge request gitlab-org/gitlab!17559

These sizes come from this design doc:

https://gitlab-org.gitlab.io/gitlab-design/hosted/design-gitlab-specs/
forms-spec-previews/

Presumably, these sizes will be *fairly* standardized so that they
don't mean different things in different places.

Fix `project_tree_restorer_spec` flakiness

Closes #35323

See merge request gitlab-org/gitlab!19427

Revamp Merge Request documentation

See merge request gitlab-org/gitlab!18644

Fixed a typo in the "Keyboard Shortcuts" pop-up

See merge request gitlab-org/gitlab!19217

Migrate issue boards specs to Jest & VTU

See merge request gitlab-org/gitlab!19265

Expand sections by default

Closes #35176

See merge request gitlab-org/gitlab!19320

Fix old content and improve structure, and remove
repetition. Also brings back content deleted by accident

Fail if a test leaves the browser logged in

See merge request gitlab-org/gitlab!18978

All QA tests expect to be able to log in at the start of the test.

That's not possible if a test leaves the browser logged in when it
finishes. Normally this isn't a problem because Capybara resets the
session after each test. But it does that in an `after` block, so when
a test, like this one, logs in in an `after(:all) block, the browser
returns to a logged in state *after* Capybara has logged it out. And
then the next test will fail.

E.g.: https://gitlab.com/gitlab-org/gitlab/issues/34736

This adds a `config.after(:context)` block to fail if a test
leaves the browser logged in.

Improve the only/except extendable jobs

See merge request gitlab-org/gitlab!17956

Move several features from create MR doc to
review MR doc. Also splits security reports into
it's own section, to allow for one ULTIMATE badge

Notice about missing support for Auto Test when using .buildpacks file

See merge request gitlab-org/gitlab!6930

Add gitlab managed apps section to dev docs

See merge request gitlab-org/gitlab!19388

Merge branch '13070-bad-interpolation-of-ci_pipeline_id-when-passing-variables-to-an-another-project-multipipeline-projects' into 'master'

Allow CI bridge to expand variables that use pipeline ID and URL

See merge request gitlab-org/gitlab!18875

Allows bridge jobs to expand variables that use
CI_PIPELINE_ID and CI_PIPELINE_URL

SCIM pagination startIndex handles string input

See merge request gitlab-org/gitlab!19331

Bump Markdown timeout from 3 to 6 seconds in test

Closes #35269

See merge request gitlab-org/gitlab!19408

Refactor ProjectTreeRestorer

See merge request gitlab-org/gitlab!18024

We've been seeing increased flaky failures due to the timeout
exceeding 3 seconds. With the additional regexp in
e38e2adc, we see that performance has
gotten worse:

```
1.376477   0.005843   1.382320 (  1.423449)
```

Previously it was:

```
0.566795 0.000933 0.567728 ( 0.569076)
```

Closes https://gitlab.com/gitlab-org/gitlab/issues/35269

Adds tests and splits a method to simplify testing

Add SharedAttributes to Geo QA scenario

See merge request gitlab-org/gitlab!19328

Migrate vue shared components  specs to Jest & VTU

See merge request gitlab-org/gitlab!19269