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.

2006/meyer/index.html

@@ -393,7 +393,7 @@ more text to fulfil the program’s requirements.</p>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>This entry turns a newspaper solitaire puzzle into a competition
 with the computer to be the last one moving. The object of this
-<a href="meyer.c">source code</a> is to determine the object of this <a href="meyer.c">source
+<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/meyer/meyer.c">source code</a> is to determine the object of this <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/meyer/meyer.c">source
 code</a>! :-)</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <p>I wanted submit a fully object-oriented entry to show that