Generalize input data

[tylerlittlefield]

I had originally hoped that we could make things more general so that a user could pass more than just text to visualize hierarchical data.

However, I am not sure what this would look like or what other datasets are out there to visualize (maybe directories, or ASTs?). I will leave this issue here for notes/brainstorming.

[mathidachuk]

I like this idea and I think it is totally possible. First we will need to completely decouple spacy from the build modules. I can work on this.

[tylerlittlefield]

Some related work:

• https://timelyportfolio.github.io/d3r/reference/d3_nest.html