[Docs Site] Use prod_devdocs_styleguide index on /style-guide/ (#23679)

* [Docs Site] Use prod_devdocs_styleguide index on /style-guide/

* reignore style guide

* remove serp footer on style guide

Author: KianNH

src/plugins/docsearch/index.ts

@@ -1,10 +1,12 @@
 import { track } from "~/util/zaraz";
 import type { DocSearchClientOptions } from "@astrojs/starlight-docsearch";
 
+const isStyleGuide = window.location.pathname.startsWith("/style-guide/");
+
 export default {
 	appId: "D32WIYFTUF",
 	apiKey: "5cec275adc19dd3bc17617f7d9cf312a",
-	indexName: "prod_devdocs",
+	indexName: isStyleGuide ? "prod_devdocs_styleguide" : "prod_devdocs",
 	insights: true,
 	// Replace URL with the current origin so search
 	// can be used in local development and previews.
@@ -20,6 +22,10 @@ export default {
 		});
 	},
 	resultsFooterComponent({ state }) {
+		if (isStyleGuide) {
+			return null;
+		}
+
 		return {
 			type: "a",
 			ref: undefined,