This is a part of the site header refactor
* Use relative units
* Add title to toggle button
* Remove unnessecary CSS
* Rewrite HTML classes
* Temporary remove drawer subsearch, it will be re-explored in a later patch
* wgLogo is always visible in the drawer
* Increase the size of wiki name
* Sitestats will now format large numbers into human readable formats (e.g. 12.2K, 3M, etc.)
* Sitestats now use icons instead of text as labels
* Remove wordmark for now, will revisit later