Add GitBook theme structure with Traditional Chinese docs

gitbook/components/CategoryGroup.js

@@ -0,0 +1,19 @@
+
+import CategoryItem from './CategoryItem'
+
+const CategoryGroup = ({ currentCategory, categoryOptions }) => {
+  if (!categoryOptions) {
+    return <></>
+  }
+  return <div id='category-list' className='pt-4'>
+    <div className='mb-2'><i className='mr-2 fas fa-th' />分類</div>
+    <div className='flex flex-wrap'>
+      {categoryOptions?.map(category => {
+        const selected = currentCategory === category.name
+        return <CategoryItem key={category.name} selected={selected} category={category.name} categoryCount={category.count} />
+      })}
+    </div>
+  </div>
+}
+
+export default CategoryGroup