API health endpoint doesn't report on health

[wkoot]

Describe the bug
The health endpoint is not actually an endpoint, it just happens to return http 200 ok like any api url path.

To Reproduce

1. Navigate to /api/health
2. Navigate to /api/randompage
3. Observe that the return data is the same

Expected behaviour
JSON return data, describing the instance health such as

{
  "health": "GREEN"
}

And, return a 404 for non-existing endpoints.