Introduces a dedicated page listing third-party ZIM content packs built
by the community. Launches with the two current add-ons (jrsphoto field
manuals, kennethbrewer W3Schools) and explains how to install a ZIM pack
and where to submit a new one for inclusion.
- New doc at admin/docs/community-add-ons.md
- Wired into DocsService DOC_ORDER (slot 4) and TITLE_OVERRIDES so the
hyphen in "Add-Ons" is preserved in the sidebar
- README gets a link under Community & Resources
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
