feat: build api reference pages for new documentation site (#1551)

.changeset/sharp-ties-jog.md

apps/next/.gitignore

apps/next/package.json

apps/next/scripts/generate-docs.mjs

apps/next/src/app/global.css

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

apps/next/typedoc.json

packages/core/src/chat-engine/context-chat-engine.ts

packages/readers/src/html.ts

packages/readers/src/image.ts

pnpm-lock.yaml