Link fix (#11368)

* fixes logo

* cleans up homepage on docs

* adds icon files and tightens margins

* cleans up sidenav, adds top nav items

* fixes a link

* removes icon files

Co-authored-by: Dan Albert <dan@solana.com>

docs/docusaurus.config.js

@@ -30,6 +30,16 @@ module.exports = {
           label: "Validate",
           position: "left",
         },
+        {
+          to: "integrations/exchange",
+          label: "Integrate",
+          position: "left",
+        },
+        {
+          to: "cluster/overview",
+          label: "Learn",
+          position: "left",
+        },
         {
           href: "https://discordapp.com/invite/pquxPsq",
           label: "Chat",