✨ feat: add new contact form, hero, features, and richtext blocks; implement scroll-reveal action and update styles

- Introduced ContactFormBlock, FeaturesBlock, HeroBlock, and RichtextBlock components.
- Implemented a scroll-reveal action for animations on element visibility.
- Enhanced CSS styles for better theming and prose formatting.
- Added localization support for new components and updated existing translations.
- Created e2e tests for demo pages including contact form validation and navigation.
- Added a video tour showcasing the demo pages and interactions.

frontend/mocking/navigation.json

@@ -5,18 +5,20 @@
         "language": "de",
         "type": "header",
         "elements": [
-            {
-                "name": "Startseite",
-                "page": "home"
-            },
-            {
-                "name": "Über uns",
-                "page": "about"
-            },
-            {
-                "name": "Kontakt",
-                "page": "contact"
-            }
+            { "name": "Startseite", "page": "/" },
+            { "name": "Über uns", "page": "/ueber-uns" },
+            { "name": "Kontakt", "page": "/kontakt" }
+        ]
+    },
+    {
+        "id": "header-en",
+        "_id": "header-en",
+        "language": "en",
+        "type": "header",
+        "elements": [
+            { "name": "Home", "page": "/" },
+            { "name": "About", "page": "/about" },
+            { "name": "Contact", "page": "/contact" }
         ]
     },
     {
@@ -25,14 +27,22 @@
         "language": "de",
         "type": "footer",
         "elements": [
-            {
-                "name": "Impressum",
-                "page": "imprint"
-            },
-            {
-                "name": "Datenschutz",
-                "page": "privacy"
-            }
+            { "name": "Startseite", "page": "/" },
+            { "name": "Über uns", "page": "/ueber-uns" },
+            { "name": "Kontakt", "page": "/kontakt" },
+            { "name": "GitHub", "external": true, "externalUrl": "https://github.com" }
+        ]
+    },
+    {
+        "id": "footer-en",
+        "_id": "footer-en",
+        "language": "en",
+        "type": "footer",
+        "elements": [
+            { "name": "Home", "page": "/" },
+            { "name": "About", "page": "/about" },
+            { "name": "Contact", "page": "/contact" },
+            { "name": "GitHub", "external": true, "externalUrl": "https://github.com" }
         ]
     }
-]
+]