Fix #459 by fixing output of overlapping matches in site.hs (#461)

In site.hs we have overlapping matches which write the same files.
We can therefore observe the order in which these are scheduled.

Author: BinderDavid

message-index/site.hs

@@ -57,7 +57,6 @@ main = hakyll $ do
 
   match "messages/*/*/index.md" $
     version "nav" $ do
-      route $ setExtension "html"
       compile getResourceBody
 
   match "messages/*/*/index.md" $ do
@@ -95,7 +94,6 @@ main = hakyll $ do
 
   match "messages/*/index.md" $
     version "nav" $ do
-      route $ setExtension "html"
       compile pandocCompiler
 
   match "messages/*/index.md" $ do