add valine comment system

[xCss]

Add Valine comment system support.

_config.yml :

  valine: # Valine. https://valine.js.org
    appid:  # your leancloud application appid
    appkey:  # your leancloud application appkey
    notify: false # mail notifier , https://github.com/xCss/Valine/wiki
    verify: false # Verification code
    placeholder: Just go go # comment box placeholder
    avatar: mm # gravatar style
    meta: nick,mail,link # custom comment header
    pageSize: 10 # pagination size
    visitor: false # Article reading statistic https://valine.js.org/visitor.html

Preview:

[foxyiy]

sas

[chris2000520]

what does 'mm' mean?

[xCss]

what does 'mm' mean?

历史遗留问题，请忽略，已更改为mp。
更多设置请参考 https://valine.js.org/avatar.html

[shanlanCoding]

valine add email / nick required
pure主题valine留言板添加：昵称、邮箱必填必写功能 | 山岚 - 90码农历险记
https://blog.gobyte.cn/post/e56fdb88.html

[zhangjizhe]

我这个部署上去会多一个黑代码块，是为什么呢？而且输入的时候报错