fix: update site URL in astro.config.mjs for Angular tutorials

- Changed the site URL from "https://dolmen-tools.github.io/angular-tutorials" to "https://tutorials.angular.courses" to reflect the new domain for the Angular tutorials.

Author: geromegrignon

astro.config.mjs

@@ -7,8 +7,7 @@ import react from "@astrojs/react";
 
 // https://astro.build/config
 export default defineConfig({
-  site: "https://dolmen-tools.github.io/angular-tutorials",
-  base: "/angular-tutorials/",
+  site: "https://tutorials.angular.courses",
   integrations: [
     starlight({
       title: "Angular Tutorials",