Misc Changes

• docs: add a note that cache components is opt-in near the top: #85245
• Docs/v16 feedback: #85259
• Update command to install babel-plugin-react-compiler as a devDependency: #85235
• docs: typegen next-env.d.ts feedback: #85273

Credits

Huge thanks to @icyJoseph and @arnabsen for helping!