Change port to 3080 (#166)

to avoid conflicts with front-end

src/Guide/Server.hs

@@ -188,7 +188,7 @@ mainWith config = do
       return cfg {
         spc_maxRequestSize = Just (1024*1024) }
     when (_prerender config) $ prerenderPages config db
-    runSpock 8080 $ spock spockConfig $ do
+    runSpock 3080 $ spock spockConfig $ do
       middleware (EKG.metrics waiMetrics)
       middleware (staticPolicy (addBase "static"))
       -- Javascript