* Fix all stylelint errors
For any errors that fixing would require changing the output of the css disable stylelint for that line instead of modifying.
* Update quality.py
Make stylelint quality check pass when there are no errors
* Delete empty selectors
Moves banner into the content instead of at the top. Adds a course
expiration fragment to the course home page, the content, the progress
page, and the discussion page.
