Added 404 page

Author: mateioprea

404.md

@@ -0,0 +1,5 @@
+---
+title: 404
+---
+### 404: Page Not Found
+The page you tried to open could not be found. You might find what you are looking for on the [homepage](http://techblog.rosedu.org) though.

site.hs

@@ -38,7 +38,7 @@ buildTechblog = do
       route   idRoute
       compile compressCssCompiler
 
-    match (fromList ["about.md", "people.md"]) $ do
+    match (fromList ["about.md", "people.md", "404.md"]) $ do
       route   $ setExtension "html"
       compile $ pandocCompiler
         >>= loadAndApplyTemplate "templates/default.html" defaultContext