docs(self-host): surface embedded IdP sync docs in sidebar (#726)

Add the embedded IdP sync pages (Microsoft Entra ID API/SCIM, Google
Workspace, JumpCloud, Keycloak) under SELF-HOST NETBIRD so users can
discover them from the navigation instead of relying on direct links.

Regroup the Authentication subsection by purpose: Local Users, Identity
Provider Connectors (wraps Self-hosted and Managed IdPs), and Provision
Users & Groups.

src/components/NavigationDocs.jsx

@@ -584,6 +584,10 @@ export const docsNavigation = [
             title: 'Authentication and IdPs',
             href: '/selfhosted/identity-providers',
           },
+          {
+            title: 'Local Users',
+            isOpen: false,
+            links: [
               {
                 title: 'Local User Management',
                 href: '/selfhosted/identity-providers/local',
@@ -592,6 +596,12 @@ export const docsNavigation = [
                 title: 'Disable Local Auth',
                 href: '/selfhosted/identity-providers/disable-local-authentication',
               },
+            ],
+          },
+          {
+            title: 'Identity Provider Connectors',
+            isOpen: false,
+            links: [
               {
                 title: 'Self-hosted IdPs',
                 isOpen: true,
@@ -654,6 +664,34 @@ export const docsNavigation = [
               },
             ],
           },
+          {
+            title: 'Provision Users & Groups',
+            isOpen: false,
+            links: [
+              {
+                title: 'Microsoft Entra ID (API)',
+                href: '/manage/team/idp-sync/embedded/microsoft-entra-id-sync',
+              },
+              {
+                title: 'Microsoft Entra ID (SCIM)',
+                href: '/manage/team/idp-sync/embedded/microsoft-entra-id-scim-sync',
+              },
+              {
+                title: 'Google Workspace',
+                href: '/manage/team/idp-sync/embedded/google-workspace-sync',
+              },
+              {
+                title: 'JumpCloud',
+                href: '/manage/team/idp-sync/embedded/jumpcloud-sync',
+              },
+              {
+                title: 'Keycloak',
+                href: '/manage/team/idp-sync/embedded/keycloak-sync',
+              },
+            ],
+          },
+        ],
+      },
       { title: 'Advanced Guide', href: '/selfhosted/selfhosted-guide' },
       { title: 'Troubleshooting', href: '/selfhosted/troubleshooting' },
       {