refactor: simplify exampleSite configuration files and switch to YAML

Include only overridden values.

config/_default/params.yaml

@@ -10,6 +10,9 @@ featuredImageField: image
 # Output full content to RSS feed
 rssFullContent: true
 
+# Path to favicon, relative to assets folder
+favicon: 
+
 footer:
   # Year when site was first published
   since:
@@ -23,6 +26,8 @@ dateFormat:
   lastUpdated: "Jan 02, 2006 15:04 MST"
 
 sidebar:
+  emoji:
+  subtitle:
   compact: false
   avatar:
     enabled: true