⌛ Add Pixelfed & Mastodon social media support.

[ildyria]

Please see #2946

Still need to add the fonts...

This is parked on wait, while font-awesome support pixelfeed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.69%. Comparing base (8488190) to head (9a11f8c).
⚠️ Report is 586 commits behind head on master.

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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[ildyria]

Unfortunately, due to the lack of fonts, I'm going to close this one.