Use a better name for search attribute (#1547)

tools/algolia-add-custom-attribute.ts

@@ -1,7 +1,7 @@
 const j = JSON.parse(Deno.readTextFileSync("_site/search.json"));
 j.forEach((entry) => {
     const crumb = entry.crumbs || [];
-    entry.weight = crumb[0] === "Guide" ? 1 : 0;
+    entry.guide = crumb[0] === "Guide" ? 1 : 0;
 })
 Deno.writeTextFileSync("_site/search.json", JSON.stringify(j, null, 2));