[mod] engine config mods

searx/settings.yml

     base_url : 'https://startpage.com/'
     search_url : 'https://startpage.com/do/search'
 
-  - name : ixquick
-    engine : startpage
-    base_url : 'https://www.ixquick.com/'
-    search_url : 'https://www.ixquick.com/do/search'
+# +30% page load time
+#  - name : ixquick
+#    engine : startpage
+#    base_url : 'https://www.ixquick.com/'
+#    search_url : 'https://www.ixquick.com/do/search'
 
   - name : twitter
     engine : twitter