feat: Tencent video shortcode and remark42 integration (#143)

* 增加remark42的评论系统支持，config中增加对应配置。

* remark42评论系统，语言配置加入到config中，修正切换theme时评论区跟随主题切换。

* - 新增腾讯视频的支持
- 支持通过frontmatter配置在文章中插入音频

* 更新readme

* Delete README.md

* Create README.md

* Remove MetingJS

* fix(shortcode/tencent): switch to HTML5

The old one was showing video using Flash.

* style(comments): clean remark42 integration code

Co-authored-by: wood <wood@hfge.cn>
Co-authored-by: Wood <34589275+hfge@users.noreply.github.com>

exampleSite/config.yaml

@@ -49,11 +49,17 @@ params:
     comments:
         enabled: true
         provider: disqus
+
         utterances:
             repo:
             issueTerm: pathname
             label:
 
+        remark42:
+            host:
+            site:
+            locale:
+
     widgets:
         enabled:
             - search