add original C links to entry navigation bars

The navigation bar for a winning entry now has a "_Original C_" link
(between the ✅ and the Inventory on the right hand side) so that one
may easily view the original C code that was submitted for IOCCC judging.

Ran `make www timestamp` to perform the above.

1995/leo/index.html

@@ -447,6 +447,7 @@
   <a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1995/leo/leo.c">C code</a>
   <a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1995/leo/Makefile">Makefile</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1995/leo/leo.orig.c">Original C</a>
   <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1995%2Fleo%2Findex.html">&#x2713;</a>
 </div>