Deprecate OFTC and matrix

[EvilOlaf]

close to nobody is using either of these services. The bridge doesn't run reliable too. Get rid of maintenance burden.

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Walkthrough

The pull request removes two outdated sections from the Community IRC documentation file: the OFTC network block containing server information, ports, and channels, and the Matrix closed beta section. All remaining Libera/IRC guidance and other documentation content remains intact. This is a documentation-only change with 12 lines of content deleted.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Deprecate OFTC and matrix' directly and specifically describes the main change: removing/deprecating OFTC and Matrix sections from the IRC documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description directly explains the rationale for removing OFTC and Matrix sections from the documentation, aligning with the changeset.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch EvilOlaf-patch-1

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