Issue #3072312 by jhodgdon, Amber Himes Matz, andypost: Review/fix/delete existing help topics

...les/help_topics/help_topics/contextual.overview.html.twig

...dules/help_topics/help_topics/core.config_basic.html.twig

...dules/help_topics/help_topics/core.config_error.html.twig

...odules/help_topics/help_topics/core.maintenance.html.twig

...ules/help_topics/help_topics/core.menu_overview.html.twig

core/modules/help_topics/help_topics/core.security.html.twig

...s/help_topics/help_topics/core.ui_accessibility.html.twig

...ules/help_topics/help_topics/core.ui_components.html.twig

...ules/help_topics/help_topics/core.ui_contextual.html.twig

.../help_topics/help_topics/help.help_topic_search.html.twig

...help_topics/help_topics/help.help_topic_writing.html.twig

...dules/help_topics/help_topics/shortcut.overview.html.twig

...s/help_topics/help_topics/shortcut.ui_shortcuts.html.twig

...les/help_topics/help_topics/system.config_basic.html.twig

...les/help_topics/help_topics/system.config_error.html.twig

core/modules/help_topics/help_topics/tour.overview.html.twig

...pics/help_topics/user.security_account_settings.html.twig

...odules/help_topics/tests/src/Functional/HelpTopicTest.php