Evaluate scraping oversight.gov for supported IGs

[konklone]

Though there's no bulk data and it doesn't cover every IG, oversight.gov at least has consistent HTML for many IGs.

Though, we also may be interested in identifying differences or gaps between what the IG publishes to their site versus what shows up on Oversight.gov. I'd be willing to bet the Oversight.gov team isn't analyzing that in a programmatic way.