better UI for 7-day moving average graphs

[durka]

The moving average lines added in #552 initially confused me -- I thought the output was broken. There is no UI describing why the graph has both lines and dots. I suggest either some explanatory text in the graph legend or a toggle to switch between fine-grained and averaged plotting.

[bstrie]

I agree that the dots look strange at first glance, though I think the current legend suffices. And I think adding a toggle might be too much, I'd suggest just removing the dots and leaving the ability to hover over a point on the graph in order to see the raw data for that period.

[nagisa]

I like the dots a lot.

[remram44]

When hovering the version numbers, the dots for that version get highlighted but not the line, that looks like a bug.

I suggest just using a checkbox to toggle the 7-day average off. I think using the average for smoothing is fine, but going half-way and showing both is just confusing. The dots just look like noise right now.

[bburdette]

this is incredibly hard to read. colors for the different versions dots are barely different from each other, and because they aren't connected with lines, its super hard to tell what dot goes with what version. how about put 7 day average into a different graph, or provide a toggle to make it visible for people who care about it?

[carols10cents]

I would love pull requests for changing any of these things!