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.

1992/marangon/index.html

@@ -387,7 +387,7 @@ numbers as needed. It is the side effects that get you into trouble. If you
 are not careful, you may find things “at 6’s and 7’s”. :-)</p>
 <p>NOTE: Some compilers have had trouble optimizing this entry.</p>
 <p>NOTE: Some systems need to compile with <code>-ltermcap</code> as well as <code>-lcurses</code>.</p>
-<p>NOTE: The original winning source <a href="marangon.orig.c">marangon.orig.c</a>, found in
+<p>NOTE: The original winning source <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/marangon/marangon.orig.c">marangon.orig.c</a>, found in
 the archive directory, assumed that <code>exit(3)</code> returns a value which cause
 problems for some systems where <code>exit(3)</code> returns a <code>void</code>. The file
 <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/marangon/marangon.c">marangon.c</a> avoids this problem.</p>