Revert "Remove email support link until it works"

[jchris]

Reverts #192

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[charliecreates]

No problems detected in the re-added mailto link—markup, semantics, and styling are consistent with surrounding links. Looks good to merge.

Summary of changes

What Changed

• Re-introduced an Email Support link into the footer of app/routes/about.tsx.
• The link uses a mailto: URI ([email protected]) and adopts the same blue color styling as the other footer links.
• Added separating middot ({' · '}) before and after the new link to keep the existing visual delimiter pattern.