Better instructions

[paddymul]

I am trying to make my custom widget work consistently in google colab. Some googling lands me on this repo, then I'm instantly confused.

This project includes an implementation of a widget manager which loads widgets from a CDN.
I don't know what a widget manager is or why I would need one.

Could you write a section of the README that addresses a widget library writer. Something like:

Widget developers

If you want your jupyter widget to work properly in google colab, please follow these steps.

...

Regular Jupyter Lab has a default widget manager. Google colab needs this custom one for the following reasons.

Here is how to configure colab-cdn-widget-manager