Move /health endpoint to /api/v1/health (making it public) (#716)

This allows us to monitor the API health more easily from a remote
service such as updown.io.

config/urls.py

@@ -8,6 +8,7 @@
 from django.views import defaults
 from django.views import static as static_views
 from django.http import JsonResponse
+from django.shortcuts import redirect
 
 from rest_framework import permissions
 from drf_yasg.views import get_schema_view
@@ -59,14 +60,18 @@
     permission_classes=(permissions.AllowAny,),
 )
 
+def health_redirect(request):
+    return redirect(API_BASE_URL + 'health')
+
 def health_check(request):
     return JsonResponse({'status': 'ok'})
 
 urlpatterns += [
     # Django Admin
     path('admin/', admin.site.urls),
 
-    path('health', health_check),
+    path('health', health_redirect),
+    path(API_BASE_URL + 'health', health_check),
 
     # api docs
     re_path(