Remove Kagi autosuggest (requires auth)

Kagi's autosuggest API requires authentication, causing "API Error".
Search still works, just without autocomplete suggestions.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

argocd/manifests/homepage/values.yaml

@@ -64,7 +64,6 @@ config:
         provider: custom
         url: https://kagi.com/search?q=
         target: _blank
-        suggestionUrl: https://kagi.com/api/autosuggest?q=
     - kubernetes:
         cluster:
           show: true