Ross

Add ability to generate `nbdev_pypi` output without uploading to PyPi

1

Uploading the dist directory to PyPi in response to a new release using GH Actions is a common workflow. Hence, having the ability to generate the dist directory without uploading...

``` net = Network() net.add_node('A') net.add_edge('A', 'A') net.add_edge('A', 'A') net.show('a.html') ``` Produces: Rather, two loops should be displayed. pyvis version 0.2.1