* Don't use body as tooltip container, allow notification area overflow
Badge tooltips are using container: 'body', so they can overflow the
notification area. When the user navigates back while a badge tooltip is
showing, the tooltip remains visible.
This commit removes the body container attribute and instead allows the
notificationDropDown to overflow, so badge tooltips aren't cut off.
Instead, this adds overflow: hidden to NotificationList.
Fixes#2118.
* Remove newline
- Fix jank in shrinking animation when search box loses focus after overlapping forum title.
- Use solid colors instead of transparent whites/blacks for colored header controls so that search box isn't transparent when it does overlap forum title.
- This also simplifies colored header variables, making them more analogous to the non-colored header variables, and allowing for the removal of some conditional CSS in the notifications dropdown button.
Some more radical changes to header layout (flexbox?) may be made when we implement the new mobile design (#867), but for now this is an acceptable fix.
- Get rid of Bootstrap (except we still rely on some JS)
- Use BEM class names
- Rework variables/theme config
- Fix various bugs, including some on mobile
The CSS is still not ideal – it needs to be cleaned up some more. But
that can be a focus for after beta.
