[del] karmasearch: remove engine (cloudflared) (#6213)

The engine is using very aggressive Cloudflare blocking for
a while now, no matter if using a normal browser like Firefox
or not.

Closes: https://github.com/searxng/searxng/issues/5976

searx/settings.yml

@@ -1228,35 +1228,6 @@ engines:
     timeout: 3.0
     disabled: true
 
-  - name: karmasearch
-    engine: karmasearch
-    categories: [general, web]
-    search_type: web
-    shortcut: ka
-    inactive: true
-
-  - name: karmasearch images
-    engine: karmasearch
-    categories: [images, web]
-    search_type: images
-    shortcut: kai
-    paging: false
-    inactive: true
-
-  - name: karmasearch videos
-    engine: karmasearch
-    categories: [videos, web]
-    search_type: videos
-    shortcut: kav
-    inactive: true
-
-  - name: karmasearch news
-    engine: karmasearch
-    categories: [news, web]
-    search_type: news
-    shortcut: kan
-    inactive: true
-
   - name: kickass
     engine: kickass
     base_url: