enable Disqus comments in site configuration

Author: JerryLinLinLin

_config.yml

@@ -102,9 +102,9 @@ avatar: https://avatars.githubusercontent.com/u/61572787
 # boolean type, the global switch for ToC in posts.
 toc: true
 
-# disqus:
-#   comments: true  # boolean type, the global switch for posts comments.
-#   shortname: 'jerrylinlinlin-github-io'   # Fill with your Disqus shortname. › https://help.disqus.com/en/articles/1717111-what-s-a-shortname
+disqus:
+  comments: true  # boolean type, the global switch for posts comments.
+  shortname: 'jerrylinlinlin-github-io'   # Fill with your Disqus shortname. › https://help.disqus.com/en/articles/1717111-what-s-a-shortname
 
 comments:
   active: 'giscus' # The global switch for posts comments, e.g., 'disqus'.  Keep it empty means disable