Update index.mdx

Add security & container guides

Author: tylergraff

docs/docs/references/index.mdx

@@ -11,6 +11,8 @@ import {useCurrentSidebarCategory} from '@docusaurus/theme-common';
   />
 </div>
 
-Nitty-gritty technical descriptions of how Nebari works.
+Technical descriptions of how Nebari works.
 
+- [Enhanced Security](enhanced-security.md) - Nebari security configuration guide
+- [Local Container Repo](container-sources.md) - Deploying Nebari from a Local Container Repo 
 <DocCardList items={useCurrentSidebarCategory().items}/>