Add Fluent design category button.
Update Account page with new design.

Add device name for Revolt Desktop.
Add Italian and Toki Pona.

Remove hooks completely. :)

200 error milestone

- replaced many uses of `as any` with another more specific cast `as T`
- filled in missing typed for items that needed to be typed
  - new runtime code was added where necessary to satisfy the new types with comments
- added missing theme variable "sidebar-active" to the Theme variables
- forms using `react-hook-form` are now typechecked
- changed some instances of `target` into `currentTarget` while removing `as any` assertions