"Extra" nonfunctional API endpoint

[corviday]

The URL of the regions API is supposed to be /api/health/regions. That URL works correctly.

However, calls made to /api/regions, an unintended URL, will also be resolved, but not entirely correctly: the summary data for each region will be correct, but the URL attribute leading to more detailed information on the region will be incorrect.

I think the right fix for this is to rewrite the routing code in ce/api/__init__.py to better separate the handling of the /api/watershed and /api/health APIs from the main '/api' APIs.