Improve memory performance by reducing dirty pages before fork

See merge request gitlab-org/gitlab-ce!23169

Fix enabling project deploy key for admins

See merge request gitlab-org/gitlab-ce!23043

Updated Gitaly to v0.133.0

See merge request gitlab-org/gitlab-ce!23148

Update asciidoctor to 1.5.8

Closes #54010

See merge request gitlab-org/gitlab-ce!23047

Don't show memory usage graph for unmerged MRs

Closes #49479

See merge request gitlab-org/gitlab-ce!22673

Fix not render emoji in filter dropdown

See merge request gitlab-org/gitlab-ce!23112

Docs: Fix zero downtime link in requirements

See merge request gitlab-org/gitlab-ce!23170

Fix broken link for Manual actions to "when:manual" section

See merge request gitlab-org/gitlab-ce!23160

Refactor CE Documentation Homepage

Closes #53124

See merge request gitlab-org/gitlab-ce!21946

Fix typos in specs and docs

See merge request gitlab-org/gitlab-ce!23084

Fix typo (install_depedencies => install_dependencies)

See merge request gitlab-org/gitlab-ce!23134

Also:

- Replace DevOps image with one with all stages.
- Further restructure page.
- Edit and tabulate lower part of page.

Includes:

- New enhanced overview button.
- Aligning the top table.
- Start of thorough edit and table reorganisation.

- Adding icons.
- Adding more stages.
- Alphabetising tables.
- Adding more links.
- Andother minor improvements.

Includes:

- Orientating page around audiences.
- Adding descriptions to all links.
- Light restructuring.
- Minor fixes.

The nakayoshi_fork gem works around the lack of a Ruby compacting
garbage collecting by calling GC.start a few times to "promote" the age
of young objects to the maximum age 3. This reduces the number of dirty
pages and consequently improves copy-on-write behavior with unicorn
and other forking Web application servers.

Admins would be prevented from adding a project deploy key since the
accessible keys would be restricted to the user's keys.

Also backports a spec for DeployKeysController from
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/8432.

Hashed Storage: allow migration to be retried in partially migrated projects

Closes #53700

See merge request gitlab-org/gitlab-ce!23087

Provide application.css from master branch via GitLab Pages

Closes gitlab-ui#95

See merge request gitlab-org/gitlab-ce!23156

Remove unneeded licenses for gitlab-org npm namsepace

See merge request gitlab-org/gitlab-ce!23155

Docs agile sprints and releases

See merge request gitlab-org/gitlab-ce!22855

Check compilation of FE assets against multiple node versions

Closes #53813

See merge request gitlab-org/gitlab-ce!23068

Use @gitlab npm namespace

Closes gitlab-ui#65

See merge request gitlab-org/gitlab-ce!22629

minor: format fix for GH import page

See merge request gitlab-org/gitlab-ce!23152