Add HTML format

[simonrenoult]

What problem are you trying to solve?

We're currently outputting either a table or a json. A cool way to visualize the complexity/churn ratio would be a graph of files. HTML + d3js or something like that should do the trick.

Describe the feature

Adding a --format=html flag to the cli that generates a public directory containing a ready to open index.html with the graph.

[medic-code]

Hey @simonrenoult I'd be interested in picking this up, could you expand bit more on what you meant by graph of files ?