Update critical file(s) according to Chirpy v5.0.0

_config.yml

@@ -87,9 +87,15 @@ avatar:
 # boolean type, the global switch for ToC in posts.
 toc: true
 
-disqus:
-  comments: false  # boolean type, the global switch for posts comments.
-  shortname: ''    # Fill with your Disqus shortname. › https://help.disqus.com/en/articles/1717111-what-s-a-shortname
+comments:
+  active:         # The global switch for posts comments, e.g., 'disqus'.  Keep it empty means disable
+  # The active options are as follows:
+  disqus:
+    shortname:    # fill with the Disqus shortname. › https://help.disqus.com/en/articles/1717111-what-s-a-shortname
+  # utterances settings › https://utteranc.es/
+  utterances:
+    repo:         # <gh-username>/<repo>
+    issue_term:   # < url | pathname | title | ...>
 
 paginate: 10
 
@@ -111,7 +117,6 @@ collections:
     output: true
     sort_by: order
 
-
 defaults:
   -
     scope:
@@ -136,7 +141,6 @@ defaults:
     values:
       layout: page
       permalink: /:title/
-      dynamic_title: true    # Hide title in mobile screens.
 
 sass:
   style: compressed