am 673b9378: Merge change Ie4b0d302 into eclair

Merge commit '673b937889d550700d9d4a80aefeedd5ebf3ecb4' into eclair-plus-aosp

* commit '673b937889d550700d9d4a80aefeedd5ebf3ecb4':
  docs: update the site homepage with 2.1 announcement