Serve static pages efficiently. Fix #53 (#118)

* 1st draft to serve static files faster

* Allow serving 5 images in a page

the 6th image cannot be served as the esp does not open more than 5 connections at the same time

* win the prize

* Update comments

http/cars.lua

@@ -31,6 +31,10 @@ return function (connection, req, args)
          It works with three embedded images of cars, but the server crashes with four. Select the number of cars you want to see below.<br>
          Whoever manages to modify nodemcu-httpserver to load all four images without crashing wins a prize!
       </p>
+      <p>
+         OK I guess I win the prize, as now you can load five cars.<br>
+            Cheers HHHartmann
+      </p>
       <p>
          choose: <a href="?n=1">show one car</a>
          <a href="?n=2">show two cars</a>