refactor: overhaul UI for streamlined user experience

Redesign navigation, home overview, user portrait, and valuation pages
with improved functionality and responsive design.

Co-authored-by: null <4804959+fnvtk@users.noreply.github.com>

app/documentation/layout.tsx

@@ -0,0 +1,9 @@
+import type React from "react"
+
+export default function DocumentationLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  return <div className="min-h-screen bg-gray-50">{children}</div>
+}