site.hs: Configure destination directory as "public"

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

site.hs

@@ -4,7 +4,7 @@ import           Data.Monoid (mappend)
 import           Hakyll
 --------------------------------------------------------------------------------
 main :: IO ()
-main = hakyll $ do
+main = hakyllWith config $ do
     match "images/*" $ do
         route   idRoute
         compile copyFileCompiler
@@ -97,6 +97,11 @@ main = hakyll $ do
 
 
 --------------------------------------------------------------------------------
+config :: Configuration
+config = defaultConfiguration {
+    destinationDirectory = "public"
+}
+
 postCtx :: Context String
 postCtx =
     dateField "date" "%B %e, %Y" `mappend`