A lot of enhancements

templates/index.html

@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Postfix statistics</title>
+  </head>
+  <body>
+    <img src="hour.png">
+    <img src="6hour.png">
+    <img src="day.png">
+    <img src="week.png">
+    <img src="month.png">
+    <img src="year.png">
+  </body>
+</html>