Large number of associated agencies breaks pdap.io/data-sources/{id} display

[maxachis]

https://pdap.io/data-source/1484

JSON data shows that it is providing agencies data for 18 agencies, all aggregated. So the problem in this case is that there is such high number of agencies being represented that it is breaking the display logic.

There are several possible solutions to this, not necessarily mutually exclusive:

1. We make the view of agencies be scrollable or collapsible once they get past a certain amount (perhaps 3).
2. We add some new components to the /data-sources/{id} endpoint to filter agencies displayed in some form or fashion.

Additionally, it appears to be interfering with the NEXT functionality in some fashion. To demonstrate, open the page for Maryland Case Explorer (https://pdap.io/data-source/1519) and click PREV until getting back to Stanford. Then click NEXT and you'll find you won't be able to get back to Maryland Case Explorer.

[josh-chamberlain]

for display issues, I'm suggesting:

1. make the view of agencies be scrollable or collapsible once they get past 3
2. don't show duplicate jurisdictions; show one tile for each, maximum
3. since we're presenting agencies and states in a tabular structure, don't show the commas; just add a little space between the columns when there's only one entry.