Update community page Twitter icon to X

[sudhishmk]

Replace the legacy Twitter icon and link on the community page with current X branding (fa-x-twitter, x.com/tektoncd). Fixes #581

Changes

Update the community page "Reach out" section to use X branding instead of legacy Twitter (icon, link, and label).

Submitter Checklist

• Includes docs (if user facing)
• Commit messages follow commit message best practices

Update the Twitter icon and link on the community page to X (x.com/tektoncd).

[tekton-robot]

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[AlanGreene]

Thanks for the PR, however it appears incomplete. The code change doesn't match the PR description.

[AlanGreene]

The PR description mentions that the logo has been updated but it's unchanged here.

[sudhishmk]

@AlanGreene Thanks for reviewing it. It seems like the site is shipping older version of Font-Awesome. "fa-x-twitter" was added in Font Awesome 6.4.2 (#19827), so changing only the class name may result in a broken or missing icon even after the URL/text are fixed.

I could see another discussion open for site revamp, so till them may be
we can just update URL + link text now, keep fa-twitter until Font Awesome is upgraded or use an inline SVG?
Alternatively we can bump Font Awesome to ≥ 6.4.2 alongside the branding update.

Let me know your thoughts on this.