Try/catch around github file decoding, await call to search in chat API, fix img width

src/khoj/interface/web/index.html

@@ -414,6 +414,10 @@
             border: 1px solid rgb(229, 229, 229);
         }
 
+        img {
+            max-width: 90%;
+        }
+
     </style>
 
 </html>