Show current week number in toolbar.
The quickest way to find out what the current week number it is.
- Icons optimizations
- Preparation for localizations (https://bugs.chromium.org/p/chromium/issues/detail?id=1268098)
- New landing page when clicking the icon
- Update to manifest v3
- Flat design
- Updates week number more frequent
- Icon added on Chrome extension page in Google Chrome