This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.
closes#1282
* fixes#1457 – check for matchMedia function before using it
* fixes: Depth issues
closes#1458
* fixes: Long breadcrumbs cause horizontal overflow
* fix: Improve tabs and overflow on mobile