refactor: 完成Handlebars模板系统基础集成

templates/components/category.hbs

@@ -0,0 +1,12 @@
+<section class="category" id="{{name}}">
+    <h2><i class="{{icon}}"></i> {{name}}</h2>
+    <div class="sites-grid">
+        {{#if sites.length}}
+            {{#each sites}}
+                {{> site-card}}
+            {{/each}}
+        {{else}}
+            <p class="empty-sites">暂无网站</p>
+        {{/if}}
+    </div>
+</section> 

templates/components/navigation.hbs

@@ -0,0 +1,21 @@
+{{#each this}}
+<div class="nav-item-wrapper">
+    <a href="#" class="nav-item{{#if active}} active{{/if}}" data-page="{{id}}">
+        <div class="icon-container">
+            <i class="{{icon}}"></i>
+        </div>
+        <span class="nav-text">{{name}}</span>
+        {{#if submenu}}<i class="fas fa-chevron-down submenu-toggle"></i>{{/if}}
+    </a>
+    {{#if submenu}}
+    <div class="submenu">
+        {{#each submenu}}
+        <a href="#{{name}}" class="submenu-item" data-page="{{../id}}" data-category="{{name}}">
+            <i class="{{icon}}"></i>
+            <span>{{name}}</span>
+        </a>
+        {{/each}}
+    </div>
+    {{/if}}
+</div>
+{{/each}} 

templates/components/site-card.hbs

@@ -0,0 +1,7 @@
+{{#if url}}
+<a href="{{url}}" class="site-card" title="{{name}} - {{description}}">
+    <i class="{{#if icon}}{{icon}}{{else}}fas fa-link{{/if}}"></i>
+    <h3>{{#if name}}{{name}}{{else}}未命名站点{{/if}}</h3>
+    <p>{{description}}</p>
+</a>
+{{/if}}