feat: improve sidebar and deployment setup

src/components/shared/site-footer.tsx

@@ -0,0 +1,27 @@
+import { GitFork } from "lucide-react";
+import { cn } from "@/lib/utils";
+
+const GITHUB_URL = "https://github.com/JetSprow/J-Board";
+
+export function SiteFooter({ className }: { className?: string }) {
+  return (
+    <footer
+      className={cn(
+        "mx-auto flex w-full max-w-md items-center justify-center gap-2 text-xs text-muted-foreground/70",
+        className,
+      )}
+    >
+      <span>J-Board</span>
+      <span className="h-1 w-1 rounded-full bg-muted-foreground/30" aria-hidden />
+      <a
+        href={GITHUB_URL}
+        target="_blank"
+        rel="noreferrer"
+        className="inline-flex items-center gap-1.5 rounded-md px-1.5 py-1 font-medium text-muted-foreground transition-colors hover:bg-muted hover:text-foreground focus-visible:outline-none focus-visible:ring-[3px] focus-visible:ring-ring/15"
+      >
+        <GitFork className="size-3.5" />
+        <span>GitHub</span>
+      </a>
+    </footer>
+  );
+}