feat: wire up clerk

+ Add convex provider with clerk
+ Add clerk provider
+ Add account page
+ Add login page
+ Add sign up page
+ Add clerk middleware
+ Add Navbar component

convex/auth.config.js

@@ -0,0 +1,10 @@
+const config = {
+  providers: [
+    {
+      domain: process.env.CLERK_JWT_ISSUER_DOMAIN,
+      applicationID: 'convex',
+    },
+  ],
+};
+
+export default config;