Switch to UWSGI and improve Docker definitions

docker/uwsgi.ini

@@ -0,0 +1,12 @@
+[uwsgi]
+chdir=/code
+module=app.wsgi:application
+env=DJANGO_SETTINGS_MODULE=app.settings
+master=1
+pidfile=/tmp/project-master.pid
+socket=0.0.0.0:8000
+harakiri=20
+max-requests=100000
+vacuum=1
+home=/venv
+processes=12