（杂项修改）增加评论系统

Author: lisniuse

docs/.vuepress/configs/head.js

@@ -87,4 +87,4 @@ module.exports = [
  defer: 'defer',
  async: 'true'
  }]
-];
+]

docs/.vuepress/styles/index.styl

@@ -16,8 +16,13 @@ pre.vue-container
  color #808080
  font-weight light
 
+.theme-default-content
+ ul
+ li
+ color lighten($textColor, 25%)
+
 .MathJax
- outline:0;
+ outline 0
 
 .home .feature
  color #4e6e8e