add an entry point file for the app and modify gunicorn config to communicate with nginx

gunicorn_config.py

@@ -1,2 +1,3 @@
-bind = "0.0.0.0:8080"
+bind = "unix:app.sock"
-workers = 2
+workers = 3
+umask = 0o007

wsgi.py

@@ -0,0 +1,4 @@
+from app import app
+
+if __name__ == "__main__":
+    app.run()