Updating to match new top-page format

doc/administration/index.md

@@ -9,12 +9,10 @@ description: 'Learn how to install, configure, update, and maintain your GitLab
 
 Learn how to administer a self-managed GitLab instance.
 
-- [Get started](../administration/get_started.md)
-- [All feature flags](../user/feature_flags.md)
-- [Configure your installation](../administration/configure.md)
-- [Configure GitLab Dedicated](../administration/dedicated/index.md)
-- [Maintain your installation](../administration/operations/index.md)
-- [Secure your installation](../security/index.md)
-- [Administer users](../user/profile/account/create_accounts.md)
+| | | |
+|--|--|--|
+| [**Get started**](../administration/get_started.md) **{chevron-right}**<br><br>Administration overview. | [**All feature flags**](../user/feature_flags.md) **{chevron-right}**<br><br>Complete list of flags. | [**Authentication and authorization**](../administration/auth/index.md) **{chevron-right}**<br><br>Third-party authentication providers. |
+| [**Configure your installation**](../administration/configure.md) **{chevron-right}**<br><br>Installation settings. | [**Update your Admin Area settings**](../administration/settings/index.md) **{chevron-right}**<br><br>Product settings. | [**Configure GitLab Dedicated**](../administration/dedicated/index.md) **{chevron-right}**<br><br>IP allowlists, SAML, maintenance. |
+| [**Maintain your installation**](../administration/operations/index.md) **{chevron-right}**<br><br>Backup and restore, move repos, maintenance tasks. | [**Secure your application**](../user/application_security/secure_your_application.md) **{chevron-right}**<br><br>SSH key limits, 2FA, tokens, hardening. | [**Administer users**](../user/profile/account/create_accounts.md) **{chevron-right}**<br><br>Passwords, user moderation, broadcast messages. |
 
 Only GitLab team members have access to administration tools and settings on GitLab.com.