Flatten the CSS rules for config forms.
Review Request #9914 — Created May 7, 2018 and submitted
Config form styling is pretty hard to override at times, since it's so
deeply nested and contains styling for most elements one would want to
This change flattens that styling, making it much easier to override in
other stylesheets. There's still some cleanup that could be done
(reordering of rules to match conventions, and moving some rules
specific to Review Board out), but that can be done in a follow-up
Went through all the pages we have in Review Board and RBCommons that
make use of configforms styling. Verified everything looked correct
and matched other instances.