Ink's design token names have been updated to be more consistent. This

change updates Djblets to use those new names in place of the old ones.

Checked for any usage of undefined CSS variables via manually scanning

the CSS variables in Chrome's display and via an extension to check for

this. Ensured that there isn't any CSS referencing any missing variables.
Checked avatars, forms, datagrids, and modal boxes for any obvious visual

issues.