Docs: Remove all remaining orphaned images.

doc/user/project/pages/img/pages_create_user_page.png

doc/user/project/pages/img/pages_dns_details.png

doc/user/project/pages/img/pages_multiple_domains.png

doc/user/project/pages/img/pages_new_domain_button.png

doc/user/project/pages/img/pages_upload_cert.png

doc/user/project/web_ide/img/enable_web_ide.png

doc/user/search/img/issues_any_assignee.png

doc/user/search/img/issues_author.png

doc/workflow/award_emoji.png

doc/workflow/img/new_branch_from_issue.png

doc/workflow/share_with_group.png