feat(community): add a Community page and link it from the main menu

[Timur Tukaev (tym83)]

Summary

cozystack.io/community returned 404, and nothing on the site pointed at the
community meeting, its recordings, or the contributor path. From the website
alone a visitor could not learn that public community calls happen at all —
they have been running every two weeks since April 2024.

What

• content/en/community.md — chat channels, the community meeting (schedule,
  Zoom link, calendar, link to the archive), contributor entry points, the
  governance documents, and the four YouTube playlists.
• hugo.yaml — a Community entry in the main menu at weight 30, so it lands
  between Blog and OSS Health.
• content/en/.gitignore — dropped the community.md line.

Why the .gitignore change

That file has been ignoring community.md, contributing.md, governance.md
and security.md under an # Imported comment, but nothing in the tree imports
them: no hack/ script, Makefile target or workflow references any of those
names. The rule only prevented the page from being committed. Only the
community.md line is removed — the other three are left alone in case they
belong to a plan I am not aware of.

Preview

Verified locally: the page renders, the menu entry appears in the expected
position, and the ref to the Developer Guide resolves.

Note for whoever builds locally — hugo newer than the pinned 0.160.1 fails on
this repo before reaching any of these changes, with
access denied: "text/html" is not whitelisted in policy "security.allowContent"
on content/<lang>/_index.html. That reproduces on a clean main too, so it is
unrelated to this PR, but it does mean the pinned version is now effectively
mandatory rather than advisory.

Localisation

Only the English page is added; the translation pipeline owns the other locales.

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[IvanHunters]

The core justification checks out: content/en/.gitignore ignores those four files under # Imported, and nothing in the tree actually imports them (every hack/ script, the Makefile and the workflows only write into content/en/docs/ and static/; the only hits for those names elsewhere are external links to the cozystack repo). Dropping the community.md line is safe. The {{% ref "/docs/v1.6/development" %}} target exists and type: "page" has a layout.

Two small things:

1. weight: 30 on the Community menu entry collides with Blog, which is also weight: 30 (content/en/blog/_index.md:6). "Between Blog and OSS Health" only holds via Hugo's alphabetical tie-break, so give it a distinct weight (e.g. 32). Note also that Blog's menu entry is front-matter-defined and English-only, while this hugo.yaml entry appears on every locale, where Community's neighbour will be GitHub rather than Blog.
2. The "hugo newer than 0.160.1 fails ... the pinned version is now effectively mandatory" note in the description is stale after the rebase: main pins 0.164.0 (netlify.toml:6, .github/workflows/hugo.yaml:35) and the landing pages are markdown. Worth dropping so it does not mislead.