docs: add showcase page (#3659)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

docs/app/composables/useSearchLinks.ts

@@ -31,6 +31,11 @@ export function useSearchLinks() {
     label: 'Figma',
     icon: 'i-simple-icons-figma',
     to: '/figma'
+  }, {
+    icon: 'i-lucide-presentation',
+    label: 'Community > Showcase',
+    description: 'Check out some of the amazing projects built with Nuxt UI.',
+    to: '/showcase'
   }, {
     label: 'Community > Contribution',
     description: 'A comprehensive guide on contributing to Nuxt UI, including project structure, development workflow, and best practices.',