(Settings) Changed styling to follow Store styling

- No longer importing font awesome and now importing glyphicons instead
- Enforcing a transparent background colour on body,html which rise-common-test version of rise.css file does not do
- In order to follow the Store styling of buttons, applying an in-page override for button styling as rise-common-test version of rise.css applies it within a .modal-footer class
- Modified styling of Close, Save, Cancel, and Help buttons to follow the styling in Store which is using glyphicons and not font awesome
- Changed the alert class from warning to danger to follow styling of Store
- Removed the use of Namespace.use, the script was previously removed
- Removed the importing of Namespace.js, the script was previously removed