feat(admin): add initial admin dashboard structure

This commit introduces the foundational structure for the new admin dashboard.

- Utilizes @nuxt/ui to build the dashboard layout, including a collapsible sidebar and navigation.
- Adds initial pages for the dashboard, news, events, and hall of fame management.
- Implements a composable `useDashboardSidebarLinks` for managing sidebar navigation.
- Refactors the default layout by integrating the header and footer directly.
- Swaps the primary and secondary theme colors across the application.

app/pages/admin/index.vue

@@ -0,0 +1,15 @@
+<template>
+  <div>
+    Login Page
+  </div>
+</template>
+
+<script lang="ts" setup>
+definePageMeta({
+  layout: "admin-login"
+})
+</script>
+
+<style>
+
+</style>