Initial Nuxt frontend import

- Complete GGZ Ecademy Nuxt.js user portal
- Learning products browser and management
- Member management interface
- User authentication and roles
- Multi-language support (NL/EN)
- Vuex store for state management
- Component-based architecture

components/UI/PageHeader/PageHeader.vue

@@ -0,0 +1,5 @@
+<template>
+  <h2 class="pa-4 txt--text">
+    <slot></slot>
+  </h2>
+</template>