docs: code review, remove "Using low level APIs"

Author: AriPerkkio

docs/tutorialkit.dev/astro.config.ts

@@ -67,10 +67,6 @@ export default defineConfig({
               label: 'Overriding Components',
               link: '/guides/overriding-components/',
             },
-            {
-              label: 'Using low level APIs',
-              link: '/guides/using-low-level-apis/',
-            },
           ],
         },
         {