Docusaurs: Validate the double npm package approach

[Jwaegebaert]

Right now, we've set up a new nodeJs project for Docusaurus in the docs folder.

It's important to check whether this approach might cause problems in the future, such as with updates to ES Modules or if we've installed similar packages, which could lead to having two node_modules folders.

Let's make sure we're not going to run into any issues and see if there's room for improvement.

Note!

When making a PR for this issue, make sure you target the branch docs-migration.

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Related to #4396