Add additional redirects based on broken links

Author: sofietoft

16/umbraco-cms/.gitbook.yaml

@@ -127,3 +127,23 @@ redirects:
     customizing/property-editors/build-a-block-editor: fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/block-editor/README.md
     tutorials/creating-and-distributing-a-package: extending/packages/creating-a-package.md
     fundamentals/design/templates/named-sections: fundamentals/design/templates/README.md
+    tutorials/custom-error-pages: tutorials/custom-error-page.md
+    reference/events/contentservice-events: reference/notifications/contentservice-notifications.md
+    reference/configuration-for-umbraco-7-and-8/webconfig: reference/configuration/README.md
+    fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor-tinymce/blocks: fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/README.md
+    fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/block-editor/build-custom-view-for-blocks: tutorials/creating-custom-views-for-blocklist.md
+    fundamentals/backoffice/property-editors/built-in-property-editors/rich-text-editor: fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/rich-text-editor/README.md
+    fundamentals/backoffice/property-editors/built-in-property-editors/nested-content: fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/block-editor/README.md
+    fundamentals/backoffice/property-editors/built-in-property-editors/block-list-editor: fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/block-editor/README.md
+    extending/ui-library: customizing/ui-library.md
+    extending/ui-documentation: customizing/README.md
+    extending/section-trees/sections: umbraco-cms/customizing/extending-overview/extension-types/sections/section.md
+    umbraco-cms/extending/property-editors: customizing/property-editors/README.md
+    extending/language-files/ui-localization: customizing/foundation/localization.md
+    extending/dashboards: customizing/extending-overview/extension-types/dashboard.md
+    extending/customize-the-editing-experience: customizing/README.md
+    extending/customize-backoffice/vite-package-setup: customizing/development-flow/vite-package-setup.md
+    extending/customize-backoffice: customizing/README.md
+    extending/content-apps: customizing/extending-overview/extension-types/workspaces/workspace-views.md
+    extending/backoffice-setup/extension-types: customizing/extending-overview/extension-types/README.md
+