updates color generation, tries fixing credentials bug

- credentials still lost the refresh token after a certain event
  - this was now fixed by completely removing any saves past the first one
  - https://trello.com/c/iORYLYHl/44-1-check-on-credentials

- Color Coding is now updated
  - fixed an incorrect color mapping in the colors.json
  - updates some calls to functions to correctly get the natural colors
  - the incorrect red -> yellow mapping might have to do with the previous credentials error

docker/calendarwatch/Dockerfile

@@ -1,10 +1,13 @@
 FROM python:3.8-slim-buster
 RUN apt-get update && apt-get upgrade
+RUN apt-get install -y cron
 RUN pip3 install flask Flask-SQLAlchemy flask_migrate flask_login flask_wtf python-dotenv
 RUN apt-get install gcc libpcre3 libpcre3-dev -y
 RUN pip3 install uwsgi
+
 RUN pip3 install email-validator
 RUN pip3 install google google-oauth google-auth-oauthlib google-api-python-client
+
 COPY docker-entrypoint.sh /usr/local/bin/
 EXPOSE 8084
 ENTRYPOINT ["docker-entrypoint.sh"]