fix many internal links

Fixed a number of internal links that need to
go to the GitHub site.

Ran `make www` to perform the above.

2004/kopczynski/README.md

@@ -101,7 +101,7 @@ the number from 8 to 11 that it thinks it is.
   (`$?` is shorter)
 
 * I achieved some additional tightness by `-Dif=while` which saved 9 chars of
-source for the cost of 11 chars of the [Makefile](Makefile). If I used
+source for the cost of 11 chars of the [Makefile](%%REPO_URL%%/2004/kopczynski/Makefile). If I used
 `-DB=while`, I would save 12 for 10, but I think the current version is slightly
 more obfuscated.
 

2004/kopczynski/index.html

@@ -436,7 +436,7 @@ number, not to print it, but if you think otherwise, the change would
 cost 6 chars (plus a warning). Change <code>return *</code> to <code>printf("%d",*)</code>.
 (<code>$?</code> is shorter)</p></li>
 <li><p>I achieved some additional tightness by <code>-Dif=while</code> which saved 9 chars of
-source for the cost of 11 chars of the <a href="Makefile">Makefile</a>. If I used
+source for the cost of 11 chars of the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/kopczynski/Makefile">Makefile</a>. If I used
 <code>-DB=while</code>, I would save 12 for 10, but I think the current version is slightly
 more obfuscated.</p></li>
 </ul>