errors derive from standard error
[#83748450]
rescue from unauthorized error
[#83748450]
rescue from forbidden error
[#83748450]
raise errors
[#83748450]
raise errors instead of using grape context
[#83748450]
remove redundant user fields from serializer
[#83748450]
add shared example for authorization
[#83748512]
add delete own account service
[#83748512]
add delete account endpoint
[#83748512]