adds uwsgi support instead of using flask dev server

- uses existing wsgi.py file

- adds wsgi.ini file
  - sets socket
  - defines application to be run, which it gets from wsgi.py file
  - uses http communication to nginx server
  - some random number of workers

- updates Dockerfile and docker-entrypoint

docker/calendarwatch/docker-entrypoint.sh

@@ -1,7 +1,5 @@
 #!/bin/sh
 cd /home/calendarwatch
-# uwsgi --http-socket 0.0.0.0:8084 -w wsgi --protocol=https 
-export FLASK_APP=/home/calendarwatch/server.py
-python3 server.py
+uwsgi --ini wsgi.ini
 echo "server has been started"