v2.0.0-beta.21

Added

• Add a frontend API Implementation for OpenEdX Dogwood/Eucalyptus
• Add a new variant "Badge" to glimpse plugin

Changed

• Improve the layout of the footer to save space
• Allow ProgramPlugin in SectionPlugin on Homepage
• Allow only one CKEditorPlugin to program_body placeholder

Fixed

• Fix an issue about PaginateSearchCourse layout
• Prevent enrollment failure if course run's resource_link does not match the
  course regexp