Add auto-generated TOC to the SSO index page

Backports #51199

docs/pages/admin-guides/access-controls/sso/sso.mdx

@@ -7,15 +7,7 @@ Teleport users can log in to servers, Kubernetes clusters, databases, web
 applications, and Windows desktops through their organization's Single Sign-On
 (SSO) provider.
 
-- [Azure Active Directory (AD)](azuread.mdx): Configure Azure Active Directory SSO for SSH, Kubernetes, databases, desktops and web apps.
-- [Active Directory (ADFS)](adfs.mdx): Configure Windows Active Directory SSO for SSH, Kubernetes, databases, desktops and web apps.
-- [Google Workspace](google-workspace.mdx): Configure Google Workspace SSO for SSH, Kubernetes, databases, desktops and web apps.
-- [GitHub](github-sso.mdx): Configure GitHub SSO for SSH,
-  Kubernetes, databases, desktops, and web apps.
-- [GitLab](gitlab.mdx): Configure GitLab SSO for SSH, Kubernetes, databases, desktops and web apps.
-- [OneLogin](one-login.mdx): Configure OneLogin SSO for SSH, Kubernetes, databases, desktops and web apps.
-- [OIDC](oidc.mdx): Configure OIDC SSO for SSH, Kubernetes, databases, desktops and web apps.
-- [Okta](okta.mdx): Configure Okta SSO for SSH, Kubernetes, databases, desktops and web apps.
+(!toc!)
 
 ## How Teleport uses SSO