docs: add a comment about why noSsr

Author: elevatebart

docs/.vuepress/config.js

@@ -17,6 +17,9 @@ module.exports = {
       {
         // uncomment next line to use a custom layout
         // layout: path.resolve(__dirname, "./components/custom-layout.vue"),
+
+        // I chose to show a component that can't be server side rendered
+        // so I use the noSsr flag to avoid the "document is not defined" error
         noSsr: true,
       },
     ],