config: Re-enable RSS output by default

Close #346

exampleSite/config.toml

@@ -19,7 +19,8 @@ defaultContentLanguage = "en"
 defaultContentLanguageInSubdir = false
 
 [outputs]
-  home = [ "HTML", "CSS" ]
+  home = [ "HTML", "CSS", "RSS" ]
+  section = [ "HTML", "RSS" ]
 
 # Configure BlackFriday Markdown rendering.
 #   See: https://gohugo.io/readfiles/bfconfig/