docs: added "users" user guides (#2565)

* docs: added "users" user guides

* docs: added user trial link to footer

www/docs/docusaurus.config.js

@@ -156,6 +156,10 @@ const config = {
         {
           title: "Community",
           items: [
+            {
+              label: "User Trials",
+              href: "https://ky5eo2x1u81.typeform.com/to/bFCQpY59",
+            },
             {
               label: "Stack Overflow",
               href: "https://stackoverflow.com/questions/tagged/medusa-commerce",