Add shortcode, partial, and css so we can display an accouncement
site-wide.
Create a shortcode for use in content/en/ _index.html so
announcement is displayed on website landing page.
Create a partial for use in layouts/docs/baseof.html so
announcement is displaye on every page in '<url>/docs/home'
directory.
Add two values to config.toml: announcement (boolean) for toggling
display of announcement; announcement_message, which is the actual
message.
Signed-off-by: Aimee Ukasick <aimeeu.opensource@gmail.com>
aimeeu