Removed aha moment
Removed site url from feed
Added challenge delete button
Added delete route for a challenge
Created backend classes for deleting challenge
Added admin capability to delete (sub)comments
Added email to user profile
Added redirection when user signs in or out
Merge branch 'master' into remove-aha-moment
Merge branch 'master' into remove-host-urls-activities
Merge branch 'master' into add-delete-challenge-button
Merge branch 'master' into add-remove-comments-subcomments
Merge branch 'master' into add-email-user-profile
Merge branch 'master' into redirect-session-change
Merge branch 'master' into remove-aha-moment
Merge branch 'master' into remove-host-urls-activities
Merge branch 'master' into add-delete-challenge-button
Merge branch 'master' into add-remove-comments-subcomments
Merge branch 'master' into add-email-user-profile
Merge branch 'master' into redirect-session-change