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.

1998/banks/index.html

@@ -519,7 +519,7 @@ to your right.</p></li>
 <li><p><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/banks/bb.sc">bb.sc</a></p>
 <p>Simple obstacle course. Try to fly over the buildings and under the
 bridges.</p></li>
-<li><p><a href="1998/banks/pyramids.sc">pyramids.sc</a></p>
+<li><p><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/banks/pyramids.sc">pyramids.sc</a></p>
 <p>Fly over the tombs of the ancient Pharaohs, in this (fictitious) Egyptian
 landscape.</p></li>
 <li><p><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/banks/river.sc">river.sc</a></p>