Simplify contribute repository link

src/pages/ContributePage.tsx

@@ -139,11 +139,16 @@ export function ContributePage() {
             </div>
             <div className="rounded-[14px] border border-[var(--p-border)] bg-[var(--p-bg)] p-4">
               <div className="mb-2 font-mono text-[10px] uppercase tracking-[0.12em] text-[var(--p-muted)]">
-                repo env variable
+                repository
               </div>
-              <code className="break-all font-mono text-[13px] text-[var(--p-text)]">
-                VITE_PLIMI_REPO_URL={repoUrl}
-              </code>
+              <a
+                href={repoUrl}
+                target="_blank"
+                rel="noreferrer"
+                className="break-all font-mono text-[13px] text-[var(--p-text)] underline decoration-[var(--p-border)] underline-offset-4 transition-colors hover:text-[var(--p-accent)]"
+              >
+                {repoUrl}
+              </a>
             </div>
           </div>
         </div>