Add Terms and Conditions page and link it from registration/footer

Adds a /terms page and links it from the site footer and from the
"I agree to the Terms and Conditions" checkbox on registration, which
previously didn't point anywhere.

src/Website/Controller/HomeController.php

@@ -35,6 +35,13 @@ final class HomeController extends AbstractController
             'website/home/help_wanted.html.twig');
     }
 
+    #[Route(path: '/terms', name: 'website_terms')]
+    public function terms(): Response
+    {
+        return $this->render(
+            'website/home/terms.html.twig');
+    }
+
     #[Route(path: '/donation/cancel', name: 'website_donation_cancel')]
     public function donationCancel(): Response
     {