Base map last updated dates

[steveoh]

basemap last cached dates and possibly link to data update doc

[steveoh]

@stdavis if this was a table like the hexagon flight dates we could show this information. Now it's a spreadsheet right?

[stdavis]

Yes, it's a spreadsheet at the moment. But I could have honeycomb write to whatever.

[chriswnek]

Reviewed and will keep in the backlog. Linking to the spreadsheet could be beneficial.