fix: Fix page layout

Author: bcbogdan

v3/docs/authentication/overview.mdx

@@ -102,7 +102,6 @@ For information on other features exposed by SuperTokens, please refer to the fo
           Deploy SuperTokens in your own infrastructure.
     </ReferenceCard.Description>
 			</ReferenceCard>
-<ReferenceCard.GridHelper />
 
 			<ReferenceCard href="/docs/migration/overview">
     <ReferenceCard.Title>