feature:

新增StickyBar组件；
标签页、分类页、搜索页重排；

components/CategoryGroup.js

@@ -0,0 +1,22 @@
+import Link from 'next/link'
+import React from 'react'
+
+const CategoryGroup = ({ currentCategory, categories }) => {
+  return <>
+    <section
+      className='text-sm font-bold py-3 px-5 text-gray-600 dark:text-gray-400 duration-100 flex flex-nowrap align-middle'>
+      <div className='w-32'>文章分类</div>
+    </section>
+    <div>
+      <div id='category-list' className='dark:border-gray-600 dark:bg-gray-800 w-66'>
+        {Object.keys(categories).map(category => {
+          return <Link key={category} href={`/category/${category}`}>
+            <div className={(currentCategory === category ? 'bg-gray-200 dark:bg-black' : '') + ' dark:text-gray-300 dark:hover:bg-gray-600 px-5 cursor-pointer py-2 hover:bg-gray-100'}><i className='fa fa-folder-open-o mr-4'/>{category}({categories[category]})</div>
+          </Link>
+        })}
+      </div>
+    </div>
+  </>
+}
+
+export default CategoryGroup