Fix broken link

mkdocs.yml

@@ -48,7 +48,7 @@ nav:
           - Footer: components/custom-apps/web-app/footer.md
           - Drafts: components/custom-apps/web-app/drafts.md
           - Side Menu: components/custom-apps/web-app/side-menu.md
-          - Sign Up, Sign In, Sign Out: components/custom-apps/web-app/sign-up-in-out.md
+          - User management: components/custom-apps/web-app/user-management.md
           - Contact: components/custom-apps/web-app/contact.md
           - Search: components/custom-apps/web-app/search.md
         - Admin GUI: components/custom-apps/admin-gui.md