Point to reference documentation on Hackage

Fixes #846

web/reference.markdown

@@ -4,7 +4,4 @@ title: Reference
 
 # Reference
 
-We keep a copy of the reference of the latest stable version here. This
-reference is automatically generated by
-[Haddock](http://www.haskell.org/haddock/). You can
-[find it here](reference/index.html).
+You can browse the reference documentation [on Hackage](https://hackage.haskell.org/package/hakyll).

web/site.hs

@@ -26,16 +26,6 @@ main = hakyllWith config $ do
         route   idRoute
         compile copyFileCompiler
 
-    -- Haddock stuff
-    match "reference/**.html" $ do
-        route   idRoute
-        compile $ fmap (withUrls hackage) <$> getResourceString
-
-    -- Haddock stuff
-    match ("reference/**" `mappend` complement "**.html") $ do
-        route   idRoute
-        compile copyFileCompiler
-
     -- Pages
     match "*.markdown" $ do
         route   $ setExtension "html"
@@ -86,26 +76,6 @@ config = defaultConfiguration
     }
 
 
---------------------------------------------------------------------------------
--- | Turns
---
--- > /usr/share/doc/ghc/html/libraries/base-4.6.0.0/Data-String.html
---
--- into
---
--- > http://hackage.haskell.org/packages/archive/base/4.6.0.0/doc/html/Data-String.html
-hackage :: String -> String
-hackage url
-    | "/usr" `isPrefixOf` url =
-        "http://hackage.haskell.org/packages/archive/" ++
-        packageName ++ "/" ++ version' ++ "/doc/html/" ++ baseName
-    | otherwise               = url
-  where
-    (packageName, version')  = second (drop 1) $ break (== '-') package
-    (baseName : package : _) = map dropTrailingPathSeparator $
-        reverse $ splitPath url
-
-
 --------------------------------------------------------------------------------
 -- | Partition tutorials into tutorial series, other articles, external articles
 tutorialsCtx :: [Item String] -> Context String

web/templates/default.html

@@ -30,7 +30,7 @@ <h1>Navigation</h1>
                 <a href="/index.html">home</a>
                 <a href="/tutorials.html">tutorials</a>
                 <a href="/libraries.html">libraries</a>
-                <a href="/reference.html">reference</a>
+                <a href="https://hackage.haskell.org/package/hakyll" target="_blank">reference</a>
                 <a href="/about.html">about</a>
                 <a href="/tutorials/faq.html">faq</a>
                 <a href="/examples.html">examples</a>