* Adds a shortcodes with an image.
* Updates the audio, stream and published shortcodes to group the
figcaption under the audio player.
* Adds a SCSS partial for grid construction that only contains for now a
breakpoint mixin'.
* Displays the cover above the player by default, and on the left side
for bigger screens.
* Fixes the SCSS files according to SCSS linting.
Co-Authored-by: iGor milhit <igor@milhit.ch>
iGor milhit