[fix] engine yummly: website were taken offline in December 2024 (#5080)

The app and website were taken offline in December 2024, with the latter
pointing to KitchenAid's US website. [1]

[1] https://en.wikipedia.org/wiki/Yummly

Closes: https://github.com/searxng/searxng/issues/5079

searx/settings.yml

@@ -2595,11 +2595,6 @@ engines:
     shortcut: wttr
     timeout: 9.0
 
-  - name: yummly
-    engine: yummly
-    shortcut: yum
-    disabled: true
-
   - name: brave
     engine: brave
     shortcut: br