feat: new doc (#1374)

.prettierignore

apps/next/.gitignore

apps/next/README.md

apps/next/components.json

apps/next/next.config.mjs

apps/next/package.json

apps/next/postcss.config.js

apps/next/public/android-chrome-192x192.png

apps/next/public/android-chrome-256x256.png

apps/next/public/apple-touch-icon.png

apps/next/public/favicon-16x16.png

apps/next/public/favicon-32x32.png

apps/next/public/favicon.ico

apps/next/public/llamaindex.svg

apps/next/public/logo-large.png

apps/next/public/logo.png

apps/next/source.config.ts

apps/next/src/app/(home)/layout.tsx

apps/next/src/app/(home)/page.tsx

apps/next/src/app/api/search/route.ts