docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations

[sileht]

Monorepo CI is not a product, it is an advanced way to consume scopes on a
specific CI. Sitting at the top level next to Merge Queue and CI Insights, it
read as a third product: customers who wanted scope-aware batching or parallel
mode clicked "Monorepo CI" and landed on a GitHub Actions job-skipping guide
instead of /merge-queue/scopes.

Delete the overview and the two per-CI setup guides, inlining their setup
content as a "Monorepo CI" section on /integrations/gha and
/integrations/buildkite. /merge-queue/scopes stays the single canonical
explanation of what scopes are; each new section opens by saying plainly that
it covers CI job skipping and points at scopes for batching and parallel mode.

The old URLs 301 to the integration pages.

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[Copilot]

Pull request overview

This PR restructures the documentation so “Monorepo CI” is no longer presented as a top-level product area, and instead becomes provider-specific guidance embedded within the GitHub Actions and Buildkite integration pages, with old Monorepo CI URLs redirected accordingly.

Changes:

• Removed the Monorepo CI top-level nav section and deleted the standalone Monorepo CI overview + per-CI setup guides.
• Inlined Monorepo CI setup content into /integrations/gha and /integrations/buildkite, and updated existing scope docs to point to these new sections.
• Added redirects from the old /monorepo-ci/* routes to the new integration sections.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/content/navItems.tsx	Removes “Monorepo CI” from the top-level navigation.
src/content/docs/monorepo-ci.mdx	Deletes the former Monorepo CI overview page.
src/content/docs/monorepo-ci/github-actions.mdx	Deletes the former GitHub Actions Monorepo CI guide (content moved to integrations).
src/content/docs/monorepo-ci/buildkite.mdx	Deletes the former Buildkite Monorepo CI guide (content moved to integrations).
src/content/docs/integrations/gha.mdx	Adds an in-page “Monorepo CI” section with GHA job-skipping guidance and examples.
src/content/docs/integrations/buildkite.mdx	Adds an in-page “Monorepo CI” section with Buildkite step-skipping guidance and examples.
src/content/docs/merge-queue/scopes/file-patterns.mdx	Updates references to point to the new Monorepo CI integration sections.
src/content/docs/merge-queue/scopes.mdx	Updates the “scopes outside merge queue” callout to link to integration sections.
src/content/docs/merge-queue/monorepo.mdx	Replaces Monorepo CI links with integration section links.
src/content/docs/merge-queue/migrate-partitions-to-scopes.mdx	Updates the tip link to the GitHub Actions integration Monorepo CI section.
public/_redirects	Adds redirects for old Monorepo CI URLs to the new integration sections.
.claude/skills/document-a-feature/references/placement-guide.md	Updates internal placement guidance to remove the monorepo-ci/ docs section.

Comments suppressed due to low confidence (2)

public/_redirects:92

• Redirect targets ending in .md likely don't exist as routes in the built Astro site (the pages are /integrations/gha and /integrations/buildkite). This redirect will probably send users to a 404. Point it to the integration page (and keep the #monorepo-ci anchor for the in-page section).

/monorepo-ci/github-actions.md /integrations/gha.md 301

public/_redirects:95

• Redirect target ends with .md, which likely isn't a valid route in the built site. Redirect to the integration page URL (and include the #monorepo-ci anchor so users land on the right section).

/monorepo-ci/buildkite.md /integrations/buildkite.md 301

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[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-07-30 13:22 UTC · Rule: default · triggered by merge protections
• ✅ Checks passed · on draft merge queue: checking main (afaa217) and #12268 together #12273
• ✅ Merged — 2026-07-30 13:24 UTC · at a7cc10e67814425b0fa22a66d19c93d8d78eecb5 · squash

This pull request spent 2 minutes 34 seconds in the queue, including 2 minutes 14 seconds running CI.

Required conditions to merge

• github-review-approved [🛡 GitHub repository ruleset rule Require pull request for default branch]
  • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268
• schedule=Mon-Fri 09:00-17:30[Europe/Paris]
• all of [🛡 Merge Protections rule Enforce conventional commit]:
  • title ~= ^(fix|feat|internal|docs|style|refactor|perf|test|build|ci|chore|revert|ui)(?:\(.+\))?!?:
    • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268
• all of [🛡 Merge Protections rule 👀 Review Requirements]:
  • any of:
    • #approved-reviews-by >= 2
      • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268
    • author = dependabot[bot]
      • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268
    • author = mergify-ci-bot
      • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268
• all of [🛡 Merge Protections rule 📕 PR description]:
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    • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268
• all of [🛡 Merge Protections rule 🔎 Reviews]:
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    • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268
  • #review-requested = 0
    • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268
  • #review-threads-unresolved = 0
    • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268
• all of [🛡 Merge Protections rule 🤖 Continuous Integration]:
  • all of:
    • check-success = build
    • check-success = lint
    • check-success = test
    • any of:
      • check-success = test-broken-links
      • label = ignore-broken-links
        • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268
    • any of:
      • check-success=Cloudflare Pages
      • -head-repo-full-name~=^Mergifyio/
        • docs: fold Monorepo CI into the GitHub Actions and Buildkite integrations #12268