Add CSS style sheet to preprocessed documentation and landing pages. Remove first button from rendered notebooks (already on page). Quarantine the home page a bit.
Add CSS style sheet to preprocessed documentation and landing pages.
Remove first button from rendered notebooks (already on page).
Quarantine the home page a bit.

PiperOrigin-RevId: 205413200

tensorflow/docs,tensorflow/docs,tensorflow/docs-l10n,tensorflow/docs