Improvements to the chart widget

Users requested some modifications to a chart widget such as the ability to remove all plots (yep, that's currently not possible) which, coupled with other requests, lead to a design refactor.

Can't share much detail but it's a very exciting project and time to be at Citi. We're always looking for new talent whether a designer, developer, sys admin, dev ops, BA or PM etc. ... feel free to get in touch.