fix: clarify use of @ts-ignore

Author: Nemikolh

docs/tutorialkit.dev/src/components/Layout/Head.astro

@@ -9,6 +9,15 @@ import Default from '@astrojs/starlight/components/Head.astro';
 <script is:inline async src="https://www.googletagmanager.com/gtag/js?id=G-64MFE82HG5"></script>
 
 <script is:inline>
+  /**
+   * We have all those @ts-ignore because the latest version of @astro/language-server
+   * type check all scripts even if they are interpreted as JavaScript by the language
+   * server.
+   *
+   * Given this script is kinda considered as external, we should do minimal changes
+   * to it. Adding a single `@ts-nocheck` didn't work :'(
+   */
+
   // @ts-ignore
   window.dataLayer = window.dataLayer || [];