Add Contextual Search (#17299) (#17300)

* this should prevent other language results appearing in the search area

(cherry picked from commit c65c4475f6)

Co-authored-by: Ryan M. Shea <8948187+rmshea@users.noreply.github.com>

docs/docusaurus.config.js

@@ -76,6 +76,7 @@ module.exports = {
       // This API key is "search-only" and safe to be published
       apiKey: "d58e0d68c875346d52645d68b13f3ac0",
       indexName: "solana",
+      contextualSearch: true,
     },
     footer: {
       style: "dark",