chore: point the repository links to Gitea and swap the GitHub icon

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

components/Footer.jsx

@@ -1,5 +1,6 @@
 import Link from "next/link";
 import Logo from "@/components/Logo";
+import GiteaMark from "@/components/GiteaMark";
 import { ArrowUpRight } from "lucide-react";
 import { SITE } from "@/lib/seo";
 
@@ -123,12 +124,10 @@ export default function Footer() {
 									href={SITE.repositorio}
 									target="_blank"
 									rel="noopener noreferrer"
-									aria-label="GitHub do projeto (abre em nova aba)"
+									aria-label="Gitea do projeto (abre em nova aba)"
 									className="grid h-11 w-11 place-items-center rounded-full border border-line text-ink transition-colors hover:border-line-strong hover:bg-surface"
 								>
-									<svg className="h-4 w-4" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true">
-										<path d="M12 .5a12 12 0 0 0-3.8 23.4c.6.1.8-.3.8-.6v-2.1c-3.3.7-4-1.6-4-1.6-.5-1.2-1.2-1.5-1.2-1.5-1-.7.1-.7.1-.7 1.1.1 1.7 1.1 1.7 1.1 1 .1 1.6-.7 1.9-1 .1-.8.4-1.3.8-1.6-2.6-.3-5.3-1.3-5.3-5.8 0-1.3.5-2.3 1.2-3.1-.1-.3-.5-1.6.1-3.3 0 0 1-.3 3.3 1.2a11.4 11.4 0 0 1 6 0c2.3-1.5 3.3-1.2 3.3-1.2.6 1.7.2 3 .1 3.3.8.8 1.2 1.9 1.2 3.1 0 4.5-2.7 5.5-5.3 5.8.5.4.9 1.1.9 2.2v3.2c0 .3.2.7.8.6A12 12 0 0 0 12 .5z" />
-									</svg>
+									<GiteaMark className="h-4 w-4" />
 								</a>
 								<a
 									href={SITE.autorLinkedin}