feat(navigation): hard-switch to Zibll navigation and Font Awesome 5

assets/admin/src/schema/index.js

@@ -9,7 +9,7 @@
  * {
  *   key: 'global.seo',
  *   title: 'SEO优化',
- *   icon: 'fas fa-search',
+ *   icon: 'fa fas fa-search',
  *   description: '...',
  *   api: { get: () => api.getSeoSettings(), save: (data) => api.saveSeoSettings(data) },
  *   defaults: { ... },
@@ -17,7 +17,7 @@
  *     {
  *       key: 'basic',
  *       title: '基础SEO',
- *       icon: 'fas fa-globe',
+ *       icon: 'fa fas fa-globe',
  *       fields: [
  *         { key: 'site_title', label: '站点标题', type: 'input', default: '' },
  *         ...