feat: add page system behing navbar items and skeletons for loading

crates/app/templates/layout/nav/nav-menu-items.html

@@ -1,6 +1,10 @@
 {% for item in items %}
   <a
-    href="#{{ item.id }}"
+    href=""
+    hx-get="{{ item.href }}"
+    hx-trigger="click"
+    hx-target="#main-container"
+    hx-swap="innerHTML"
     class="{{ Self::get_classes(self, item.current) }}"
     aria-current="{% if item.current %}page{% endif %}"
   >