Add investigate button

We're overriding the progress-bar class in [waylon.css](https://github.com/rji/waylon/blob/02ec7db976d7449511fb3ae65fc75d40e7a4a521/public/css/waylon.css#L108-L127) to make it white. Therefore we wouldn't want this to be `progress-bar-info`, just `progress-bar`.

https://github.com/rji/waylon/blob/02ec7db976d7449511fb3ae65fc75d40e7a4a521/views/data.erb#L38-L52