Improve codebase quality & consistency

[skovy]

Currently, there is limited linting and enforced formatting. As part of this issue, ideally, we can improve the codebase consistency:

• [ ] Enforce consistent file naming. Most of the codebase is kebab case (kebab-case) but there are a few files that are camel case.
• [ ] Enforce consistent it/test usage. Currently, it's mixed.
• [ ] Enforce a newline between it/describe blocks.
• [ ] Ensure assertions are invoked (eg: toBeNull)
• [ ] Test stylesheets
• [ ] Consistent spacing between functions, JSDocs, etc.
• [ ] Consistent JSDocs
• [x] Upgrade to latest TypeScript
• [ ] Upgrade build process to use tsup
• [ ] Update deployment process to use dripit