Web based witness visualization
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### Quickstart

With `node.js`:

    $ npx http-server -c-1 
    $ open http://127.0.0.1:8080

Or with `python3`:

    $ python3 -m http.server
    $ open http://127.0.0.1:8000

### Caching

As web-browser like to cache stuff, for now just use `ctrl-shift-r` 
(or `cmd-shift-r` on mac) to reload the page after changes.