update to cayman theme

_config.yml

@@ -30,9 +30,10 @@ twitter_username: jekyllrb
 github_username:  jekyll
 
 # Build settings
-theme: jekyll-athena
+remote_theme: pages-themes/[email protected]
 plugins:
-  - jekyll-feed
+- jekyll-remote-theme # add this line to the plugins list if you already have one
+- jekyll-feed
 
 # Exclude from processing.
 # The following items will not be processed, by default.