refactor(components): separate page shells from reusable components

Additional info:
  - move page-specific shells into src/components/pages/
  - keep reusable building blocks and home sections in their existing component folders
  - update PageLayout and the home route imports to the new page-shell paths
  - preserve current page behavior while making the component tree easier to navigate

www/src/pages/es/index.astro

@@ -1,4 +1,4 @@
 ---
-import HomePage from '../../components/HomePage.astro';
+import HomePage from '../../components/pages/HomePage.astro';
 ---
 <HomePage lang="es" />

www/src/pages/index.astro

@@ -1,4 +1,4 @@
 ---
-import HomePage from '../components/HomePage.astro';
+import HomePage from '../components/pages/HomePage.astro';
 ---
 <HomePage lang="en" />