Improve documentation

[jbpenrath]

Feature Request

Richie 2.0.0 comes with many new features. The documentation needs to be updated accordingly.

Here is non exhaustive list of topics to be covered:

• [x] How to add a new language?

• Configuration settings details

  • RICHIE_AUTHENTICATION_DELEGATION
  • RICHIE_LMS_BACKENDS
  • RICHIE_COURSE_RUN_SYNC_SECRETS
  • Cache settings (CACHES, CMS_CACHE_DURATIONS)
  • Filer settings
  • i18n settings ?

• Configure and run development over TLS

• Server to server requests between richie et openedx docker-compose stacks

• Django CMS

  • Placeholder and Plugins available

• Integration guide

  • Error templates customization
  • Frontend overrides (js & css)