chore(results): add OpenPowerlifting data attribution footer

src/app/pt/competicoes/resultados/page.tsx

@@ -1,5 +1,16 @@
 import { ResultsTable } from "@/components/competitions/ResultsTable";
+import Link from "next/link";
 
 export default function ResultadosPage() {
-  return <ResultsTable />;
+  return (
+    <div>
+      <ResultsTable />
+      <footer className="mt-6">
+        <p className="text-sm muted">
+          Esta página utiliza dados do projeto OpenPowerlifting,{' '}
+          <a href="https://www.openpowerlifting.org" target="_blank" rel="noopener noreferrer">https://www.openpowerlifting.org</a>.
+        </p>
+      </footer>
+    </div>
+  );
 }