Make markdown output "ugly"

This makes it so, for example, `/blog/swapfile-guide` has markdown file
at `/blog/swapfile-guide.md` instead of `/blog/swapfile-guide/index.md`.

exampleSite/hugo.yaml

@@ -18,6 +18,9 @@ markup: # this just keeps the bobatheme markup styling
 outputs:
   _merge: deep
 
+outputFormats:
+  _merge: deep
+
 params:
   author:
     name: bbaovanc