cleanup

updated readme

update readme / remove favicon.js

- Switch to using usernames rather than emails for auth

- Adding flask security settings for the switch
- integrate a better abstract base class for models save/delete
- update login_user form to allow username login
- rewrite the install command
- add Role to app context
- drop requirement for mandatory user email

Major upgrade: Flask 2.0 and flask-secuerity 4, update other libs whi…

…le keeping compatibility

- Added Favicons generator

fix pathes and a few bugs

 fix typo in celery settings

dix docker exception by defaulting flask session to filesystem instea…

…d of redis

fix missing new flask-session dependency