Difficulty Generating labextension Folder within JupyterLab Project Directory

[eeeeeeeason]

Dear contributors,

Firstly, thank you for creating this exciting project. There is great potential in the use of multi-user collaboration, and I'm currently developing tools related to this. However, I have encountered an issue that I hope can be addressed.

Issue Description:

I'm following the developer setup instructions as stated on the Contributing Guide. Here are the steps I've taken:

### path: jupyterlab/packages
pip install --upgrade pip
git clone https://github.com/jupyterlab/jupyter_collaboration
cd jupyter_collaboration
pip install -e ".[dev,test]"

Although the installation seems successful, I've noticed that the labextension folder isn't created within the jupyter_collaboration/jupyter_collaboration directory, thereby causing problems connecting the extension to JupyterLab.

Interestingly, if these same instructions were executed outside the jupyterlab project directory, everything works as expected with the labextension folder being correctly generated.

Expected Behavior:

My expectation is that the labextension folder will be correctly generated even within the JupyterLab project directory, allowing normal connection to the plugin.

Could you provide some advice or guidance on how to achieve this? I appreciate your time and assistance.

Best regards,
eason

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