feat: add authentication and user management features

- Implemented AuthButton component for Discord sign-in and sign-out functionality.
- Created CopyButton component for copying server IP addresses.
- Developed EventCard and GradeCard components for displaying events and grades.
- Added Footer and Navbar components for site navigation and information.
- Introduced PurchaseButton for handling grade purchases with Stripe integration.
- Created SectionHeader component for consistent section titles.
- Implemented session management with SessionProvider for NextAuth.
- Set up PostgreSQL database with Docker and Prisma for data management.
- Added admin guard functionality to restrict access to certain routes.
- Configured NextAuth with Discord provider for user authentication.
- Defined Prisma schema for user, admin, grade, event, and purchase models.
- Seeded database with initial grades and events data.
- Added SVG hero image for the landing page.
- Extended NextAuth types to include additional user properties.

components/footer.tsx

@@ -0,0 +1,35 @@
+import { siteConfig } from "@/lib/site";
+
+export default function Footer() {
+  return (
+    <footer className="border-t border-white/5 bg-slate-950/90">
+      <div className="mx-auto flex w-full max-w-6xl flex-col gap-6 px-6 py-10 text-sm text-slate-400 md:flex-row md:items-center md:justify-between">
+        <div className="space-y-2">
+          <p className="text-xs uppercase tracking-[0.3em] text-slate-500">
+            BinouzUHC
+          </p>
+          <p className="text-sm text-slate-300">
+            {siteConfig.serverAddress} - Minecraft {siteConfig.version}
+          </p>
+        </div>
+        <div className="flex flex-wrap items-center gap-4 text-xs uppercase tracking-[0.2em]">
+          <a href="#presentation" className="transition hover:text-white">
+            Presentation
+          </a>
+          <a href="#grades" className="transition hover:text-white">
+            Grades
+          </a>
+          <a href="#events" className="transition hover:text-white">
+            Events
+          </a>
+          <a href="#discord" className="transition hover:text-white">
+            Discord
+          </a>
+        </div>
+        <p className="text-xs text-slate-500">
+          (c) 2026 BinouzUHC. All rights reserved.
+        </p>
+      </div>
+    </footer>
+  );
+}