Preparation to move the docs to the main repository

[RaananW]

This removes a dependency that prevents us from using npm on this repository.

It is still using yarn, but npm is fully supported.

tpedoc was also updated to support a newer version of typescript.

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Name	Status	Preview	Comments	Updated (UTC)
documentation	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 20, 2024 5:22pm

[RaananW]

Part of https://github.com/BabylonJS/Babylon.js/issues/15094