Problem/Motivation
See: #2489460: [Meta] Move module.theme.css files to Classy
Proposed resolution
Move the CSS files to classy
Rename the files to remove the .theme. extension
Alter the system.base library so the CSS files are loaded with a similar weight to before
Remaining tasks
Test steps
Check that the CSS file was deleted from the module and added to Classy
Check that the references to that CSS file removed from the system module
Check that the CSS file is being loaded in the correct places in Classy
Check that there are no HTML classes in the module that relies on the theme CSS
User interface changes
None for Classy, Stark will be more Stark
API changes
None
