docs: add guides to docs (#3830)

docs/.vuepress/config.js

@@ -34,6 +34,14 @@ module.exports = {
           "/introduction/what-is-tendermint"
         ]
       },
+      {
+        title: "Guides",
+        collapsable: false,
+        children: [
+          "/guides/go-built-in",
+          "/guides/go"
+        ]
+      },
       {
         title: "Apps",
         collapsable: false,