Add top level link to Clusters page (#11276)

Co-authored-by: publish-docs.sh <maintainers@solana.com>

docs/docusaurus.config.js

@@ -17,7 +17,7 @@ module.exports = {
       links: [
         {
           to: "introduction",
-          label: "Docs",
+          label: "Introduction",
           position: "left",
         },
         {
@@ -30,6 +30,11 @@ module.exports = {
           label: "Validators",
           position: "left",
         },
+        {
+          to: "clusters",
+          label: "Clusters",
+          position: "left",
+        },
         {
           href: "https://discordapp.com/invite/pquxPsq",
           label: "Chat",