Add API support for wiki pages

Closes #12747

See merge request !13372

Add description template examples to the docs

Closes #37499

See merge request !14073

Remove the `pretty` parameter for `usage_data`

Closes #36595

See merge request !14091

Implement fix for n+1 issue on `flatten_tree` helper

Closes gitaly#530

See merge request !14097

Update capybara 2.6.2 -> 2.15.1

See merge request !13976

Fix mr tabs position

Closes #37487

See merge request !14064

Refactor the Autodeploy docs

Closes #37151

See merge request !13906

Remove duplicate task `bundle exec rake gettext:po_to_json` from CI

See merge request !14098

Remove focus styles from dropdown empty link

Closes #37023

See merge request !13907

Add quick submission on user settings page

Closes #37359

See merge request !14007

It is already run in "bundle exec rake gitlab:assets:compile".

Fix broken link on Kubernetes Monitoring page - docs

Closes #37532

See merge request !14094

reset namespace columns in migration

See merge request !14089

Update GITALY_SERVER_VERSION to 0.38.0

See merge request !14087

Fix text color for `Copy link` action on Note more actions dropdown

See merge request !14084

Add changelog entry for new dropdown styles

See merge request !14092

Fix 422 error when retry job

Closes #33281

See merge request !14082

Wiki table of contents are now properly nested to reflect header level

See merge request !13909

Migrate creating/deleting a branch to Gitaly

See merge request !13864

Fixed sidebar icon size in ie11

Closes #37512

See merge request !14080

Resolve "Projects::CommitsController#show is slow partially due to SQL queries"

Closes #34509

See merge request !13762

Clarify documentation about performance bar

[ci skip]

See merge request !14085

First time contributor badge

Closes #35161

See merge request !13902

Now the instance variable assignment is all contained within
`#initialize`, and the `children.push` behavior is more explicit.

Most of the logic is now self-contained within the `HeaderNode` class.

Fix division by zero for blame age map

Closes #35441

See merge request !13803

Fix problems sanitizing URLs with empty passwords

Closes gitlab-ee#3352

See merge request !14083