docs(next): update document (#1402)

.prettierignore

apps/next/public/og.png

apps/next/src/app/docs/[[...slug]]/page.tsx

apps/next/src/app/docs/layout.tsx

apps/next/src/app/og/[...slug]/Geist-Bold.ttf

apps/next/src/app/og/[...slug]/Geist-Regular.ttf

apps/next/src/app/og/[...slug]/og.tsx

apps/next/src/app/og/[...slug]/route.tsx

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

apps/next/src/content/docs/llamaindex/meta.json

apps/next/src/content/docs/llamaindex/setup/cloudflare.mdx

...ext/src/content/docs/llamaindex/setup/getting-started.mdx

apps/next/src/content/docs/llamaindex/setup/meta.json

apps/next/src/content/docs/llamaindex/setup/next.mdx

apps/next/src/content/docs/llamaindex/setup/node.mdx

apps/next/src/content/docs/llamaindex/setup/typescript.mdx

apps/next/src/content/docs/llamaindex/setup/vite.mdx

...t/src/content/docs/llamaindex/starter/getting-started.mdx

apps/next/src/content/docs/llamaindex/starter/meta.json

apps/next/src/content/docs/llamaindex/what-is-llamaindex.mdx