1.0.0-beta.2

Added

• add dependency to bootstrap 4.4.1 and font-awesome 5.13.0
• add button to insert a link in AshleyEditor component

Changed

• build the forum CSS theme inside ashley instead of using the compiled CSS
  file distributed with django-machina
• coalesce SASS color variables between django-machina and bootstrap
• use a fluid container for a better iframe integration
• change SASS colors