fix: only show enabled endpoints on /api route

[Thomas Threadgold]

Currently, the /api route will show links to all endpoints. This should be changed so it only returns enabled endpoints.

Current

{
  "page": "http://localhost:8080/api/pages/",
  "user": "http://localhost:8080/api/users/",
  "plugin": "http://localhost:8080/api/plugins/",
  "config": "http://localhost:8080/api/configs/"
}

Expected

If you only have the page resource type enabled:

{
  "page": "http://localhost:8080/api/pages/"
}