Broken link in documentation

[Hind-M]

The link used here is broken.
I would be happy to send a PR but I am not sure what to put instead.
https://jupyter-notebook.readthedocs.io/en/stable/extending/ maybe?

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[blink1073]

Hi @Hind-M, yes, please! Since Notebook 7 uses Jupyter Server now, we can use https://jupyter-notebook.readthedocs.io/en/v6.5.4/extending/handlers.html.