[change] Reduce library size #392
Description
The build size is huge. We need to reduce it.
I am ready to get rid of features we don't use, eg:
- https://openwisp.github.io/netjsongraph.js/examples/netjsongraph-graphGL.html
- https://openwisp.github.io/netjsongraph.js/examples/netjsonmap-animation.html
- I don't understand what's this for: https://openwisp.github.io/netjsongraph.js/examples/netjsongraph-nodeExpand.html, I am not entirely sure if it's useful or not..