document self service in admin config page

SSO-Auth/Config/config.js

@@ -397,4 +397,7 @@ export default function (view) {
     console.log(current_mappings);
     ssoConfigurationPage.populateRoleMappings(current_mappings, container);
   });
+
+  view.querySelector("#sso-self-service-link").href =
+    ApiClient.getUrl("/SSOViews/linking");
 }

SSO-Auth/Config/configPage.html

@@ -45,6 +45,23 @@
               >roadmap
             </a>
             for more information.
+            <br />
+            To allow users to manage their own SSO accounts, including linking
+            SSO providers, and removing existing links, they need to visit
+            <a
+              is="emby-linkbutton"
+              id="sso-self-service-link"
+              class="button-link"
+              >the self service page </a
+            >. <br />
+            You can use
+            <a
+              is="emby-linkbutton"
+              href="https://jellyfin.org/docs/general/clients/web-config.html#custom-menu-links"
+              class="button-link"
+              >custom menu links
+            </a>
+            to accomplish this.
           </p>
 
           <form id="sso-load-config" class="esqConfigurationForm">