Landing page (layouts/guides/landing.html):
- Remove sidebar filter (checkboxes, language buttons)
- Hero section: guide count, large "Guides." heading, description
- Sticky left "Jump to" nav with numbered categories and counts
- Sections per tag with 2-column card grid (title | summary)
- Scrollspy via IntersectionObserver highlights active section
- No Alpine.js filtering — browse by scrolling/jumping

Content pages (layouts/guides/list.html, new):
- Clean left sidebar: just mainnav, no guide-specific metadata
- Slightly wider article (max-w-5xl)
- TOC stays in right column via baseof.html default

Other:
- data/tags.yaml: add description to each tag (shown under section heading)
- layouts/_partials/guide-languages.html: deleted (languages removed in Phase 1)
- layouts/_partials/sidebar/guides.html: simplify (remove stepper, resource_links,
  languages — now just title, summary, tags, time, back link)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Tag taxonomy expanded from 7 to 9 tags:
- languages (new): 17 language/framework guides pulled from cicd
  (angular, bun, cpp, deno, dotnet, golang, java, laravel, nextjs,
   nodejs, php, python, r, reactjs, ruby, rust, vuejs)
- cicd: now pipeline/build tools only (gha, bake, azure-pipelines,
  docker-build-cloud, docker-compose, opentelemetry, etc.)
- labs (new): 12 interactive lab guides previously scattered across
  ai, security, and cicd; now grouped together at the end

Landing page tag order: languages, ai, testing, cicd, security,
databases, deployment, admin, labs

Also fixes carried over from build testing:
- Broken front matter delimiters in container-supported-development.md
  and dhi-openshift.md (resource_links[]--- → newline before ---)
- Orphaned url: lines in 16 guide files (leftover resource_links children)
- 96 broken relative links in 18 merged guide _index.md files
  (containerize.md, configure-github-actions.md etc. → ./ or anchor)
- /guides/docker-scout/sbom.md and s3c.md refs in sbom.md → /guides/docker-scout/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…rome

Guide content pages now use a clean, centered reading layout:
- Drop the 320px left sidebar for the whole guides section (baseof.html
  conditions the desktop sidebar on type != guides; mobile drawer kept)
- Remove the obsolete /guides/** -> layout: series cascade in hugo.yaml so
  collapsed guides route to guides/list.html instead of the old series layout
- New guides/single.html + updated guides/list.html: centered reading column
  (max-w-[92ch]) with the TOC taking the remaining width, justify-center so
  the pair sits balanced rather than left-heavy
- Render the guide summary as a lead paragraph under the h1 (content-default)
- aside.html: auto-hide the TOC scrollbar until hover (new scrollbar-hover
  utility)
- breadcrumbs: use an absolute font-size so they render identically inside
  prose (guide pages) and outside it (landing)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

- Instant client-side filter (Alpine.js) matching title, summary, and tags
  across the already-rendered guide list; multi-word queries are AND-matched
- Refined search input with inline clear button and Esc-to-clear
- While filtering: hide the jump-to rail and go single-column full-width,
  flatten the grouped sections into one list, and show a "N of M guides"
  meta bar with a Clear action
- Container fills the viewport (min-height) so a single result no longer
  collapses the page
- Whole-row link cards with hover affordance (arrow), plus a polished
  empty-results state

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

- Convert every directory-based guide from a branch bundle (_index.md =
  section) to a leaf bundle (index.md = single page). URLs and any
  co-located images are preserved; the guides are now kind=page, not
  sections.
- Re-collapse the Node.js guide on top of main's refresh (docker#25319): merge
  the refreshed containerize/develop/run-tests/configure-github-actions/
  secure-supply-chain/deploy topics into one page, drop the languages
  field, move tags under params ([languages]), and add aliases for the
  old /guides/nodejs/<topic>/ URLs.
- Landing: enumerate guides with RegularPagesRecursive instead of .Pages
  so every guide is listed (now that they're regular pages), including the
  nested frameworks/laravel guide that the non-recursive .Pages missed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

- genai-video-bot, pre-seeding: remove stray "---" lines that a Phase 1
  front-matter delimiter fix mistakenly inserted after lines ending in
  dashes (the .env separator and a psql table rule). Those lines broke
  out of indented code fences, so markdownlint saw code as headings
  (MD022/MD023/MD025) and a dangling fence (MD040).
- cpp: repoint a stale body link from the old /guides/language/cpp/
  multistage/ path (collapsed away) to /guides/cpp/, fixing the htmltest
  broken-link error. Front-matter aliases keep the old paths intact.

Verified: markdownlint clean on both files; hugo --gc --minify
--panicOnWarning --printUnusedTemplates builds clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>