Improve consistency of settings window sidebar categories' text and icons
Summary:
This is in support of the initiative to make settings' window sidebar categories
consistent throughout KDE software by doing the following:
- Remove the word "Settings" from the category names (this is implicit, and not done in other KDE software)
- Use the app's own icon for the General category
- Use all colorful icons
Test Plan:
Before:
After:
Reviewers: VDG, Ark, elvisangelaccio
Reviewed By: Ark, elvisangelaccio
Subscribers: kde-utils-devel
Tags: Ark
Maniphest Tasks: T10165
Differential Revision: https://phabricator.kde.org/D24270