Reimplement 'data missing' background image as an svg path

[almossawi]

No description provided.

[hamilton]

excellent! This will be fun ~

[almossawi]

I wasn't sure whether you'd be available today, so I moved it to v2.1 :) I'll start updating the documentation in a bit.

[hamilton]

Yeah I think that's wise - I have limited time in front of a computer over the next few days unfortunately

[almossawi]

@hamilton A second pair of eyes would be good. Let me know your thoughts.

Missing charts are configurable and vary slightly from one chart to another. We're using the same css rules as our lines and areas, so we don't need to do anything extra for the dark theme.

[hamilton]

Looks pretty good - thanks for taking that on. I might make a few small changes tomorrow, in particular adding margins to the missing chart type so they visually cohere a little more with non-missing charts

[almossawi]

Sounds good 👍