Migrate docs to VitePress

[dereuromark]

Summary

Migrates the docs from a flat docs/sections/ markdown layout to a structured VitePress site at https://dereuromark.github.io/cakephp-queue/.

Structure

Section	Pages
Guide	basic-setup, queueing-jobs, custom-tasks, configuration, cron, multi-connection, realtime-progress, mailing
Tasks	execute, email, mailer (built-in tasks reference)
Admin	dashboard (was admin_dashboard.md), statistics
Reference	tips, misc, limitations, upgrading

All section files renamed to kebab-case under topic folders. Internal markdown links rewritten to absolute VitePress paths. Co-located images preserved with relative paths. Local search, sitemap, lastUpdated timestamps, and brand-colored theme included. Custom SVG logo + favicon shipped under docs/public/.

Files of note

• docs/.vitepress/config.ts — sidebar, nav, search, sitemap, lastUpdated, editLink
• docs/.vitepress/theme/custom.css — brand colors and hero glow
• .github/workflows/deploy-docs.yml — builds and publishes to GitHub Pages on push to master (paths-filter on docs/**)
• CONTRIBUTING.md — moved from docs/ back to repo root so GitHub's PR/issue UI auto-links it
• composer.json — added support.docs URL
• README.md — points users at the deployed docs URL

Manual step required after merge

GitHub repo Settings → Pages → Source = "GitHub Actions" (one-time toggle so the deploy workflow can publish).

Heads-up

External bookmarks to docs/sections/*.md will 404 after merge — intentional restructure cost. Worth a one-line note in the next release.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.54%. Comparing base (8c3a746) to head (535eb67).
⚠️ Report is 1 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #489   +/-   ##
=========================================
  Coverage     77.54%   77.54%           
  Complexity      966      966           
=========================================
  Files            45       45           
  Lines          3238     3238           
=========================================
  Hits           2511     2511           
  Misses          727      727           

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