Remove local-first overview, will be added later

Author: steida

apps/web/src/app/(docs)/docs/overview/page.mdx

@@ -30,7 +30,6 @@ export const navigation: Array<NavGroup> = [
   {
     title: "Local-first",
     links: [
-      { title: "Overview", href: "/docs/overview" },
       { title: "Playgrounds", href: "/docs/playgrounds" },
       { title: "Examples", href: "/docs/examples" },
       { title: "Indexes", href: "/docs/indexes" },