Docs: Clean up headers in markdown

See merge request gitlab-org/gitlab-ce!30597

Some markdown headers needed tweaking to adhere
to standards, including blank lines above and below,
only one space after hash, first header should be
h1, and only one h1 per doc

Improve code quality documentation

Closes #60725

See merge request gitlab-org/gitlab-ce!30545

PerhAdd documentation for Design Management feature

See merge request gitlab-org/gitlab-ce!30448

Add Go test guidelines

See merge request gitlab-org/gitlab-ce!29159

Improve GitLab and Docker configuration docs

Closes #31379

See merge request gitlab-org/gitlab-ce!30498

Also make security warning more visible and
improves instructions.

Add Rugged calls to performance bar

See merge request gitlab-org/gitlab-ce!30983

Add "security" top-level item to group sidebar

See merge request gitlab-org/gitlab-ce!30604

Add "Security & Compliance" as top-level item to the project sidebar

See merge request gitlab-org/gitlab-ce!30564

Add support for exporting repository type data for LFS objects

See merge request gitlab-org/gitlab-ce!30830

A project can have the same `LfsObject` linked with up to three
`LfsObjectsProject` records. Each of these records would be for a
different repository, recorded in the `repository_type` property. The
different repositories at time of writing are "project", "wiki", and
"design". See https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/13894

This change exports the list of `repository_type`s as a JSON mapping of
oid => repository_types, which are imported to recreate the correct
`LfsObjectsProject` records.

https://gitlab.com/gitlab-org/gitlab-ee/issues/11090

Fix incorrect web server selection parameter in init.d script

Closes #64802 and #65008

See merge request gitlab-org/gitlab-ce!31076

Default manual_sorting feature flag to on

See merge request gitlab-org/gitlab-ce!30788

Use knapsack to parallelize E2E tests run via package-and-qa

See merge request gitlab-org/gitlab-ce!30886

There should be no difference between jobs in package-and-qa.

Review apps should also be similar but there might be differences
if the runners have different resources.

[ci skip]

CE port of EE branch qa-staging-61-fix-ee-project-templates-spec

See merge request gitlab-org/gitlab-ce!30835

Improving packages navigation in project sidebar [CE Backport]

See merge request gitlab-org/gitlab-ce!30256

Resolve "Review App debugging sometimes fail because multiple Unicorn pods exist"

Closes #64996

See merge request gitlab-org/gitlab-ce!31058

Environment variable USE_WEB_SERVER should have the value of the selected webserver when calling bin/web startup script.

Fixes #65008

Prefer `flat_map` over `map` + `flatten` in specs

See merge request gitlab-org/gitlab-ce!31052

Although `flat_map` is equivalent to `map` + `flatten(1)`
(note the level 1) we can apply this same refactoring to all cases.

Resolve "Add interactive links in the Admin Area overview"

See merge request gitlab-org/gitlab-ce!29306

Update dependency @gitlab/ui to ^5.7.1

See merge request gitlab-org/gitlab-ce!31026

Correct an omitted word

See merge request gitlab-org/gitlab-ce!31083

Add notes to the docs about setting service variables for users wanting to do so from the UI

See merge request gitlab-org/gitlab-ce!30863

Fix duplicated suggestion in Danger gem warning

See merge request gitlab-org/gitlab-ce!31088

This will help diagnose the source of excessive I/O from Rugged
calls. To implement this, we need to obtain the full list of arguments
sent to each request method.

Introduces new `feature_entry` helper for dashboard.
This helper reduces code duplication when listing available features
and relevant links to configuration sections

Remove beta from group and instance clusters

See merge request gitlab-org/gitlab-ce!31059

Moves the security dashboard and dependency list into it's own
top-level navigation item named 'Securty & Compliance', within the
project's sidebar.

This should only affect EE, since the template changes only touch
partials that get conditionally rendered and only exist in EE.

This commits moves the second-level navigation item
'Security Dashboard' into a top-level item.

The rendering of the actual item is EE specific.

Add empty chart component

Closes #60947

See merge request gitlab-org/gitlab-ce!30682