Add web dashboard

[wksantiago]

Adds web dashboard on port 8080 with real-time node and mempool stats via WebSocket.

[wksantiago]

Here is how it looks:

[leishman]

I appreciate the effort and it's a great idea, but this is a zero dependency project and this introduces a dependency!

[kwsantiago]

@leishman commit 27fb72b removes dependencies

[wksantiago]

Awesome, thanks — I totally missed that point!

And @kwsantiago , really appreciate the update on the code and removing those dependencies.

I appreciate the effort and it's a great idea, but this is a zero dependency project and this introduces a dependency!