Update repository URLs to GitHub

Change all references from git.mleku.dev/mleku/plebeian-signer to
github.com/PlebeianApp/plebeian-signer for the public release.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

projects/firefox/src/app/components/home/info/info.component.html

@@ -10,7 +10,7 @@
 <span>&nbsp;</span>
 
 <span> Source code</span>
-<a href="https://git.mleku.dev/mleku/plebeian-signer" target="_blank">
-  git.mleku.dev/mleku/plebeian-signer
+<a href="https://github.com/PlebeianApp/plebeian-signer" target="_blank">
+  github.com/PlebeianApp/plebeian-signer
 </a>