Default <ConfigTabs> to api tab

`cli` has been removed, so shouldn't be the default

Author: mrbbot

docs/src/content/components/mdx/config-tabs.js

@@ -20,15 +20,15 @@ let tab;
 try {
   tab = localStorage.getItem("tab");
 } catch (e) {}
-document.documentElement.setAttribute("data-tab", tab || "cli");
+document.documentElement.setAttribute("data-tab", tab || "api");
 })();`;
 
 function getTabFromStorage() {
   let tab;
   try {
     tab = localStorage.getItem("tab");
   } catch (e) {}
-  return tab || "cli";
+  return tab || "api";
 }
 
 function setTab($tabs, tab) {