* master: (199 commits)

Conflicts:
	lib/gitlab/ci/pipeline/seed/stage.rb

Fix LDAP login without user in DB

See merge request gitlab-org/gitlab-ce!17988

Add test for new README.md in docs

Closes #44647

See merge request gitlab-org/gitlab-ce!17991

Redesign application settings to match project settings (part 1)

See merge request gitlab-org/gitlab-ce!17937

Improve how we populate pipeline with stages and builds

Closes #43941

See merge request gitlab-org/gitlab-ce!17841

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Update omniauth-twitter 1.2.0 -> 1.4

See merge request gitlab-org/gitlab-ce!17876

* Replace btn-save with btn-success
* Add id to each section so it can be directly linked
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Resolve "Slow SQL running in production queryid 3257994922"

Closes #43552

See merge request gitlab-org/gitlab-ce!17934

Merge branch 'YarNayar/gitlab-ce-23460-send-email-when-pushing-more-commits-to-the-merge-request' into 'master'

Send notification emails when push to a merge request

Closes #23460

See merge request gitlab-org/gitlab-ce!17865

Bump `state_machines-activerecord` to `0.5.1`

See merge request gitlab-org/gitlab-ce!17924

[CE] ProtectedBranch API omits empty declared params

See merge request gitlab-org/gitlab-ce!17993

Docs organize main page by product category

See merge request gitlab-org/gitlab-ce!17429

Array.fill polyfill for IE 11 compatibility.

Closes #44103

See merge request gitlab-org/gitlab-ce!17897

Prefer index.md instead since they provide clean URLs in the docs site

Disable cursor for review mode in the IDE

Closes #44307

See merge request gitlab-org/gitlab-ce!17955

Merge branch '43316-controller-parameters-handling-sensitive-information-should-use-a-more-specific-name' into 'master'

Resolve "Controller parameters handling sensitive information should use a more specific name"

Closes #43316

See merge request gitlab-org/gitlab-ce!17796

Closes #23460

To make design consistent with project settings

Next admin area application settings are afected by this commit:

* Visibility and access control
* Account and limit settings
* Sign in
* Sign up
* Help page
* Pages
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

add SHA1 fingerprint requirement

See merge request gitlab-org/gitlab-ce!17976

Remove N+1 query for Noteable association.

Closes #43150

See merge request gitlab-org/gitlab-ce!17956

Resolve "Forking with namespace doesn't work (API)"

Closes #40798

See merge request gitlab-org/gitlab-ce!17815

Resolve "Update grape to v1.0.2 when it is released"

Closes #40843

See merge request gitlab-org/gitlab-ce!17983