Remove invalid git submodule.

[ArthurSonzogni]

Hi Matteo,
Could you please take a look?

I am just removing an issue on my way, but I totally ignore what I am touching here ;-)

Please note that git doesn't support storing empty directory, so the build/ directory will probably not be created on git clone. If it is required to exist, you probably need to add a placeholder file in this directory.

[mbasso]

Hi @ArthurSonzogni,
thank you for opening an issue and following with this PR!
I checked the problem and it seems that there are some folders/files into the website folder that should not have been pushed. Therefore, the build folder, automatically generated by docusaurus, is one of the those. I think we should delete them and fix the website/.gitignore file.
At the moment has something like this:

website/translated_docs
website/build/
website/yarn.lock
website/node_modules

website/i18n/*
!website/i18n/en.json

We should remove the website prefix for each line except the third one that should be deleted entirely, since we want to push yarn.lock .
Can you please update the PR, so I can merge?

[ArthurSonzogni]

Thanks! I addressed your comments.

[mbasso]

Perfect! Thank you!