Change `within` to `page.within` in feature steps

features/steps/admin/applications.rb

features/steps/admin/groups.rb

features/steps/admin/users.rb

features/steps/dashboard/new_project.rb

features/steps/dashboard/starred_projects.rb

features/steps/explore/projects.rb

features/steps/groups.rb

features/steps/profile/profile.rb

features/steps/project/active_tab.rb

features/steps/project/commits/branches.rb

features/steps/project/commits/commits.rb

features/steps/project/commits/tags.rb

features/steps/project/deploy_keys.rb

features/steps/project/fork.rb

features/steps/project/issues/filter_labels.rb

features/steps/project/issues/issues.rb

features/steps/project/issues/labels.rb

features/steps/project/merge_requests.rb

features/steps/project/network_graph.rb

features/steps/project/project.rb