am 462cc377: docs: implement sdk announcement in a collapsible box and revise the \'special\' box color and add rounded corners.

Merge commit '462cc37742b4e7d8e348ac9264eb3e5e35cbfeef' into eclair

* commit '462cc37742b4e7d8e348ac9264eb3e5e35cbfeef':
  docs: implement sdk announcement in a collapsible box