Split the admin LessCSS files into multiple files.

Review Request #10656 — Created Aug. 9, 2019 and submitted

Review Board

The administration CSS is a mess, largely due to needing to work around
much of Django's own admin CSS rules to get things to look how we want.
This is going to be required for Django 1.11 support, as our CSS just
doesn't work with what they now have.

As a first step to cleaning this all up, this change splits up the admin
LessCSS files, helping us stay more organized. This will make it easier
to determine which styles are specific to certain components or pages of
the admin UI.

Right now, the styles built to override the Django Admin UI live in a
django.less file. The goal is to create a new file containing a more
manageable base set of styles, and to eventually remove or reduce the
rules in django.less.

This change also does not modify any styles or change them to use the
new naming scheme.

Tested all affected pages in the admin UI.

  1. Ship It!
Review request changed

Status: Closed (submitted)

Change Summary:

Pushed to release-4.0.x (92d769e)