[mod] engines: remove seekr engine

Looks like https://www.seekr.com/ was sold to an other company
that does something with enterprise AI and no longer provides any
web search engine.

searx/settings.yml

@@ -2584,29 +2584,6 @@ engines:
       results: HTML
       language: de
 
-  - name: seekr news
-    engine: seekr
-    shortcut: senews
-    categories: news
-    seekr_category: news
-    disabled: true
-
-  - name: seekr images
-    engine: seekr
-    network: seekr news
-    shortcut: seimg
-    categories: images
-    seekr_category: images
-    disabled: true
-
-  - name: seekr videos
-    engine: seekr
-    network: seekr news
-    shortcut: sevid
-    categories: videos
-    seekr_category: videos
-    disabled: true
-
   - name: stract
     engine: stract
     shortcut: str