chore: reduce optional config defaults

_config.yml

@@ -36,7 +36,7 @@ social:
   # It will be displayed as the default author of the posts and the copyright owner in the Footer
   name: your_full_name
   email: example@domain.com # change to your email address
-  fediverse_handle: "@you@domain.com" # change to your fediverse handle or leave empty
+  fediverse_handle: # fill in your fediverse handle. E.g. "@username@domain.com"
   links:
     # The first element serves as the copyright owner's link
     - https://twitter.com/username # change to your Twitter homepage