Improve setup script (add prod and CI parameters)
Improve calling of setup script in CI configuration
Add doc generation action to CI configuration

Add requirements to automatically build the documentation using sphinx
Add basic configuration for documentation
Add django-docs app to deliver documentation as part of the app under /docs/
Add generating/updating of the docs to the setup and update scripts

This remove the AKTags model and its usage in views, forms, templates, translations, and backup script
This implements #164

This consists of a bash script to call and prepare as well as a python script to process the dump created by django and restrict it to the entries related to the event

closes #58

Adapt settings
Add i18n urls to central url conf
Add language chooser to base.html
Adapt readme and utils

add Utils directory
add Utils README
add setup script
add check script
add update script
document usages in top-level README