Use a single column tempalte for config plugins when in mobile

src/khoj/interface/web/base_config.html

@@ -112,5 +112,11 @@
             display: inline-block;
             font-size: 16px;
         }
+
+        @media screen and (max-width: 600px) {
+            .section-cards {
+                grid-template-columns: 1fr;
+            }
+        }
     </style>
 </html>