1. Removed some more unused scripts
2. Simplified the way we build `version` in to the source

- Remove unused CSS files
- Set up the `.wasm` files to be automatically copied in
- `sql-wasm-debug.wasm` is removed entirely since we never use the
debug/dev build of sql.js. This reduces the app download size by 1MB on
the server side. It may be worth enabling the debug build automatically
in the future?

~based on #1114~

This brings its build process up to date with the rest of the project.
We can now use Node 20 to build successfully.

Closes #918

It turns out this command is not installed by default on macOS.
Fortunately the code doesn’t really require it to be used.

This PR converts everything (aside from electron) from CommonJS to ESM.
It is needed to reduce the changes that will happen during the migration
to Typescript (as TS does not play nice with CJS).

Basically:
- rewrite `require()` to `import`
- rewrite `module.exports` to `exports`
- introduce `ts-node` to run importers so we can convert them to TS too

Lastly, sorry for this larg-ish PR, not my preference but when I tried
to reduce its scope, I would end up with mixed commons/esm that was even
more tricky to handle.

These files will be automatically recreated by `yarn build:api`,
`yarn build:browser`, and `yarn start:browser`, so we don’t need
them in the repo.

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Co-authored-by: Tom French <15848336+TomAFrench@users.noreply.github.com>