Sayt-0 f7d0fe773b docs: convert content to portable Hugo-clean Markdown ...

Implements the source-side cleanup for the docs.docker.com Hugo module
mount (#3371, phase 1.1):

- replace Liquid relative_url links with plain relative Markdown links
- drop permalink front matter (paths already match the URLs)
- convert HTML callouts to GitHub-style alerts (NOTE, TIP, IMPORTANT,
  WARNING), keeping custom titles as a bold lead line
- replace theme HTML card and feature grids with Markdown lists
- add keywords front matter to every content page
- document the new callout, link, and availability badge conventions
  in STYLE.md
- tune the markdownlint config to the house style; docs lints clean

Also fixes pre-existing issues surfaced by the conversion: an undefined
site.examples_url variable, a malformed Liquid URL, two absolute links
that bypassed the baseurl, two broken heading anchors, HTML entities
rendering literally inside code spans, and a dead Docker Sandboxes URL.

The github.io homepage (index.md) and 404.md intentionally keep Jekyll
Liquid and theme HTML: they are never mounted on docs.docker.com.

2026-07-02 13:34:54 +02:00

..

index.md

docs: convert content to portable Hugo-clean Markdown

2026-07-02 13:34:54 +02:00