Feature Request: publish package on a private pypi server?

Hello, my organization uses nbdev extensively. To use the packages in Colab, we need to clone and install the repo each time we wish to use the package that we've developed in Colab. `nbdev_release_pypi` by default publishes the package to the public pypi server, is there any plan to add a feature to publish the package to a private pypi server?

maybe additional params can be added in the `settings.ini` to make this possible? Any thoughts on this? @hamelsmu @seeM ?

Start by reading the nbdev_release_pypi entry point and the existing settings.ini configuration described in the issue. Determine how package publishing currently targets the public PyPI server and what configuration would be needed for a private server. Done means a documented, working way to publish packages to a private PyPI server without breaking the existing public-PyPI flow.

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