strictNullChecks was off for docs, which lets errors slip through and
leads to incorrect required/optional typing on Zod-inferred types. This
PR enables strictNullChecks and fixes all the existing violations.
* Add all missing libraries in the packages/apps.
* Add all missing Vitest imports to the tests.
* Add some missing exports to ui.
* Fix the admonition export.
* Fix various minor bugs.
* Migrate the ui package to use vitest.
* fix: streamline admonition types
Streamline types available for admonitions:
- Remove `info` and replace with `note`
- Add `deprecation`
Display the type on all admonitions, even if they have a label. Makes it
explicit what level of advice you are looking at (since color and icon
are ambiguous).
* change admonition to use alert under the hood
Charis