(DOCS-12720): Fixing broken url on index page

Author: jeff-allen-mongo

source/index.txt

@@ -29,8 +29,8 @@ Aggregation Functionality
   provide further insight into your data.
 
 Seamless Integration with MongoDB |service|
-  |charts-short| provides seamless integration with `MongoDB Atlas
-  <docs.atlas.mongodb.com>`__. You can link |charts| to
+  |charts-short| provides seamless integration with
+  :atlas:`MongoDB Atlas </>`. You can link |charts| to
   |service| projects and quickly get started visualizing your |service|
   cluster data.