Make diff specs compatible w/ BootstrapVue 2

See merge request gitlab-org/gitlab!20989

Remove feature flag for limiting diverging commit counts

See merge request gitlab-org/gitlab!20999

Update README.md, improving sort of environment variables by lexicographical order.

See merge request gitlab-org/gitlab!21002

Add unitless example for start_in

See merge request gitlab-org/gitlab!20895

Revert "Merge branch 'marginalia' into 'master'"

Closes #37897

See merge request gitlab-org/gitlab!21015

This reverts merge request !19759

Restyled Markdown to match GitLab style guide

See merge request gitlab-org/gitlab!20013

Update markdown.md with missing  audio file extensions.

See merge request gitlab-org/gitlab!18471

In GitLab 12.4 via
https://gitlab.com/gitlab-org/gitlab/merge_requests/16737, we required
the frontend to request at most 20 branches in the
`Projects::BranchesController#diverging_commit_counts` endpoint to avoid
Gitaly N+1 issues. This commit removes the feature flag and makes this
behavior mandatory. In the past week, there do not appear to be any
rejections, which would show up as 422 errors.

Programmatically document column ignores

See merge request gitlab-org/gitlab!19963

Makes the security dashboard empty state a scoped slot

See merge request gitlab-org/gitlab!18382

- Defaults to a generic empty state message.
- Set explicit messages for:
- - Group Dashboard
- - Project Dashboard
- - Pipeline Dashboard

Limit the merge request target branch autocompletion action to group or project scope

See merge request gitlab-org/gitlab!20933

Improve .groups_user_can_read_epics performance

See merge request gitlab-org/gitlab!20833

Refactor environment table titles and spacing

See merge request gitlab-org/gitlab!20769

Add dependency scanning flag

See merge request gitlab-org/gitlab!20743

Resolve "Docs feedback: Need to document required permissions"

Closes #35933

See merge request gitlab-org/gitlab!20861

Allow intra-project MR dependencies

Closes #34735

See merge request gitlab-org/gitlab!20858

Link correct template in the Maintenance policy

See merge request gitlab-org/gitlab!20914

Edit backup section in patch_versions documentation

See merge request gitlab-org/gitlab!20609

(cherry picked from commit b0e531b7836ae8ce149e2d57384a071131f625eb)

Update upgrade path recommendations

See merge request gitlab-org/gitlab!20878

Add clarification suggesting 11.11.x -> 12.0.x

Include create_personal_snippet ability for new/create snippet actions

See merge request gitlab-org/gitlab!20838

In this MR we check the create_personal_snippet ability
whenever we show the button to create a new snippet. It
also changes the place the ability is created to avoid
scoping it inside a Snippet.

Docs: add badge to feature available for admins only

See merge request gitlab-org/gitlab!20774

Marginalia inclusion

Closes #27857

See merge request gitlab-org/gitlab!19759

Combine frontend style guides - docs

Closes gitlab-org/frontend/general#25

See merge request gitlab-org/gitlab!20969

This is part of a wider effort to consolidate
frontend development guides. Issue here:
https://gitlab.com/gitlab-org/frontend/general/issues/25

Keyset pagination for `Project` based on `id` column

See merge request gitlab-org/gitlab!19623