Disable the bing engine

see
* https://github.com/searxng/searxng/discussions/1209
* https://github.com/searxng/searxng/issues/941
* https://github.com/searxng/searxng/pull/1219

searx/settings.yml

@@ -313,6 +313,7 @@ engines:
   - name: bing
     engine: bing
     shortcut: bi
+    disabled: true
 
   - name: bing images
     engine: bing_images