Add information about past runs
We should include information about past runs to these pages in a machine readable format. I played around with a simple plotting script to read run information from an excel file a few months ago, see https://git.ligo.org/patrick-brady/run-schedule-plots. I think the excel format is not great, but perhaps a csv or json format would work. I didn't settle on a good way to represent the runs, breaks, etc, but perhaps it's useful for somebody as a starting point.