Replace websocket dependency with ws

[tomaka]

Fix #2588

The websocket package on NPM is just kind of fucked up, and it is impossible to make it work on both ModuleJS and CommonJS. This PR switches to ws, which works fine.
This was previously not possible because we were using the websocket library in the browser as well. This is no longer the case.

The biggest effort was updating the demo.

Additionally, I've made some tweaks to the tsconfig.json to disable some magic features. I removed them as a first attempt at understanding the issue. They turned out to be unrelated, but they're better left disabled anyway.

[mergify]

Automatically approving tomaka's pull requests. This auto-approval will be removed once more maintainers are active.

[tomaka]

Since this PR makes a small tweak to index-browser.ts, I've tested this change in the browser, and it works.

[github-actions]

twiggy diff report

Difference in .wasm size before and after this pull request.

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