Remove all addon style overrides from Solomon #115
Description
Currently with our addons, we have addon-specific styles which override the core styles, within the Solomon app. We want the addon to be as separated as possible, so let's move all the override styles out of Solomon and into the addon. The styles from the addon get added before the Solomon styles so the selectors will need to have higher specificities than in Solomon. The addon variables can be blanket moved across to the addon as they will only be used in the addon.