[Site] Use AssetMapper for 6.4 for install

Author: weaverryan

ux.symfony.com/templates/main/homepage.html.twig

@@ -31,10 +31,8 @@
 
     <div class="row">
         <div class="col-12 col-md-6">
-            <twig:Terminal>
-                composer require symfony/webpack-encore-bundle symfony/stimulus-bundle
-                npm install
-                npm run watch
+            <twig:Terminal bottomPadding="145">
+                composer require symfony/asset-mapper symfony/stimulus-bundle
             </twig:Terminal>
         </div>