Create new reference architectures page

See merge request gitlab-org/gitlab!30781

- `availability/index.md` to `reference_architectures/index.md`
- `high_availability/index.md` to `reference_architectures/index.md`
- `scaling/index.md` to `reference_architectures/index.md`

Disable db:check-schema on gitlab-foss

Closes #216214

See merge request gitlab-org/gitlab!30999

Do not run the CI job db:check-schema on gitlab-foss.

Fixes https://gitlab.com/gitlab-org/gitlab/-/issues/216214

Indicate topics are optional

See merge request gitlab-org/gitlab!30264

Remove instances of deprecated Snippet code calls

See merge request gitlab-org/gitlab!30739

Docs for container registry on <12.5 or no LE

See merge request gitlab-org/gitlab!28716

Docs for Omnibus container registry assume LetsEncrypt and 12.5+

Merge branch '210232-select-the-first-option-if-there-is-only-one-metric-option-on-alerts-dropdown' into 'master'

Resolve "Alerts dropdown should select the first option if only one metric is present"

See merge request gitlab-org/gitlab!29857

Update GitLab UI/SVG

See merge request gitlab-org/gitlab!30955

Cleanup OAuth2 links between related pages

See merge request gitlab-org/gitlab!30924

Add GitLab Pages log location to log system

See merge request gitlab-org/gitlab!30868

Update wording around GitLab.com upload limits

Closes gitlab-com/gl-infra/infrastructure#9997

See merge request gitlab-org/gitlab!30833

Unify spelling of "Status Page" in docs

See merge request gitlab-org/gitlab!30914

Update WAF logs link

See merge request gitlab-org/gitlab!30912

Add praefect replicas rake task to praefect docs

Closes gitaly#2678

See merge request gitlab-org/gitlab!30889

Change placeholder in search input for Analytics features

Closes #214301

See merge request gitlab-org/gitlab!29858

Docs: Include a link to charts garbage collection

See merge request gitlab-org/gitlab!30789

Add a number of missing logs

See merge request gitlab-org/gitlab!30799

Update minikube commands for Helm 3

See merge request gitlab-org/gitlab!30788

Move Design Management policies to FOSS

See merge request gitlab-org/gitlab!29995

Cleanup incorrect log details

See merge request gitlab-org/gitlab!30792

Change wording of merge request threads counter

See merge request gitlab-org/gitlab!30217

Directly show count of unresolved threads instead of
forcing users to calculate the resolved-resolvable
counts in their heads.

Add multi-line if without braces as bad example

See merge request gitlab-org/gitlab!30676

Monokai and Solarized Dark syntax highlighting theme for Web IDE

See merge request gitlab-org/gitlab!30931

Add support for Solarized Dark syntax highlighting theme for the Web IDE

Insights Analytics: Add title to page

See merge request gitlab-org/gitlab!30853

Value Stream Analytics: Cleanup title section

See merge request gitlab-org/gitlab!30841

Dark theme for dropdowns in the Web IDE

See merge request gitlab-org/gitlab!30513