feat: new doc (#1374)

apps/next/src/content/docs/index.mdx

apps/next/src/lib/get-contributors.ts

apps/next/src/lib/source.ts

apps/next/src/lib/utils.ts

apps/next/tailwind.config.js

apps/next/tsconfig.json

package.json

packages/autotool/examples/02_nextjs/package.json

packages/llamaindex/e2e/examples/nextjs-agent/package.json

...ges/llamaindex/e2e/examples/nextjs-agent/src/app/page.tsx

.../llamaindex/e2e/examples/nextjs-edge-runtime/package.json

.../llamaindex/e2e/examples/nextjs-node-runtime/package.json

pnpm-lock.yaml