closes #4048
* fix: remove overflow x in toc * fix: use useMemo * fix: parsing /settings/integrations/slack * fix: no transparency in firefox * fix: remove debounced fn
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