doc: 更新文档

docs/_config.yml

@@ -1,2 +1 @@
 theme: jekyll-theme-cayman
-description:

docs/_layouts/default.html

@@ -20,8 +20,6 @@
 
   <header class="page-header" role="banner">
     <h1 class="project-name">{{ page.title | default: site.title | default: site.github.repository_name }}</h1>
-    <h2 class="project-tagline">{{ page.description | default: site.description | default: site.github.project_tagline
-      }}</h2>
     <a href="./editor/" class="btn">立即使用</a>
     {% if site.github.is_project_page %}
     <a href="{{ site.github.repository_url }}" class="btn">在GitHub上查看</a>