fix(builder): avoid return an error if is not possible remove an image
docs(customizing_deis): create new section for customization
Merge pull request #2453 from gabrtv/customizing-deis

docs(customizing_deis): create new section for customization
Merge pull request #2452 from aledbf/avoid_builder_push_rm_error

fix(builder): avoid return an error if is not possible remove an image
docs(managing_deis): add store to backup/restore docs
Merge pull request #2415 from carmstrong/backup_restore_store

docs(managing_deis): add store to backup/restore docs