1.0.0-beta.6

Changed

• Clean built frontend files before each build
• Upgrade node to version 14, the current LTS
• Fix import of the user model in the factory
• Filter search results to current LTIContext

Added

• add react components to manage moderators for current LTIContext
• add django rest framework to promote/revoke moderators for current LTIContext
• add new role moderator and permission to manage moderators
• allow sorting discussion topics
• add a LTI ID field in the sandbox settings to be able to have multiple
  forums for a same LTIContext
• autoload for AshleyEditor component and translation to frontend
• add API endpoint and Amazon S3 to upload image

Fixed

• fix sorting on sticky and announcements topics