[Feature Request] Add some new function

[DynamicLoader]

What problem does the feature solve?

1. 当用户登录之后跳转回博客页面，跳到的是页面头部而不是评论区；
2. 使用Github API v4 用户必须登录，否则看不到评论；
3. 评论区支持Markdown，却没有预览；
4. Github API v4好像不稳定，导致评论时常加载失败；

Proposed solution

1. 加入判断，登录后滚动到评论的div；
2. 在用户没登录时使用Github API v3或其他方式获取评论；
3. 添加预览功能；
4. 加入失败时重载评论的按钮？

Additional context

如果能异步加载评论就更好了！

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.