feat: overhaul landing page with demo gallery, preview mockup, and fix links

- Add 'Featured Examples' section with 6 popular repos (express, flask, zod, etc.)
- Add browser window mockup in hero showing what generated docs look like
- Fix all links: company.repi.fun → vectry.tech, github.com → gitea.repi.fun
- Update stats: ~3 min generation, 10+ languages supported
- New ExampleRepos client component with generate-on-click functionality

apps/web/src/components/navbar.tsx

@@ -38,13 +38,13 @@ export function Navbar() {
               ))}
               
               <a
-                href="https://github.com"
+                href="https://gitea.repi.fun/repi/codeboard"
                 target="_blank"
                 rel="noopener noreferrer"
                 className="flex items-center gap-2 text-sm text-zinc-400 hover:text-white transition-colors"
               >
                 <Github className="w-4 h-4" />
-                GitHub
+                Source
               </a>
             </div>
 
@@ -77,13 +77,13 @@ export function Navbar() {
               ))}
               
               <a
-                href="https://github.com"
+                href="https://gitea.repi.fun/repi/codeboard"
                 target="_blank"
                 rel="noopener noreferrer"
                 className="flex items-center gap-2 text-sm text-zinc-400 hover:text-white transition-colors py-2"
               >
                 <Github className="w-4 h-4" />
-                GitHub
+                Source
               </a>
             </div>
           </div>