Docs cleanup fe

See merge request gitlab-org/gitlab-ce!26158

Add highest_role method to User

See merge request gitlab-org/gitlab-ce!25462

Implemented trimming for item's name in Web IDE

Closes #57540

See merge request gitlab-org/gitlab-ce!26270

Mock and wait for timers in Jest

Closes #56056

See merge request gitlab-org/gitlab-ce!26433

Automate base domain help text on Clusters page

Closes #57357

See merge request gitlab-org/gitlab-ce!26124

Display draft when toggling replies

Closes #48211 and #56364

See merge request gitlab-org/gitlab-ce!25563

Display the database adapter name in a human-friendly way

See merge request gitlab-org/gitlab-ce!26437

Improve Youtrack documentation for style

See merge request gitlab-org/gitlab-ce!26457

YouTrack docs review

Closes #58225

See merge request gitlab-org/gitlab-ce!26454

Clarify wiki permissions

Closes #53964

See merge request gitlab-org/gitlab-ce!23044

Start moving back to regular fe_docs
Remove Initiatives, add section to index in fe_guide
Delete some no-longer-relevant parts from principles
Update title - Progressive Enchancement is a browser-support term
and could be confused
"When to use" parts are discussed elswhere
Vue & jQuery issue is no longer relevant
Delete duplicate Security docs
Remove empty files, move event_tracking
Shuffle index sections around
Remove sections on Vue & Webpack (we say same thing in prev paragraph)
Remove link to Droplab docs

Fix markdown table header and table content borders

Closes #57655

See merge request gitlab-org/gitlab-ce!25666

Rollback change that adds :not(js-syntax-highlight) pseudo-class
to markdown selectors to fix syntax highlight tables in
MR code suggestions. Removes redundant inclusion of
md-typography mixin as an alternative fix.

Resolve "Kubernetes > Create cluster > Add help text to environment field"

Closes #56944

See merge request gitlab-org/gitlab-ce!25891

Resolve "Buttons on group page are misaligned"

Closes #57894

See merge request gitlab-org/gitlab-ce!26292

Remove .raw from JavaScript fixture file names

Closes #59201

See merge request gitlab-org/gitlab-ce!26430

[ci skip]

Docs: Rewrite Work In Progress MR page

Closes #34559

See merge request gitlab-org/gitlab-ce!25732

Fix duplicated bottom match line

Closes #59147

See merge request gitlab-org/gitlab-ce!26402

Handle cases when authorized_keys doesn't exist

See merge request gitlab-org/gitlab-ce!26347

There is nothing more to say but

"Commits that change 30 or more lines across at least three files
must describe these changes in the commit body"

Add documentation reference for chatops feature flag commands

See merge request gitlab-org/gitlab-ce!26425

Add issue template for database reviewer

See merge request gitlab-org/gitlab-ce!25867

Update merge request widget pipeline block to accommodate post-merge pipelines

See merge request gitlab-org/gitlab-ce!25745