fix internal links in entry index.html from 1984 thru 2012

1995/vanschnitz/index.html

@@ -171,7 +171,7 @@ in 2023. See <a href="#alternate-code">Alternate code</a> below.</p>
 <pre><code>    ./try.sh</code></pre>
 <h2 id="alternate-code">Alternate code:</h2>
 <p>The authors provided a spoiler version of the program. Originally uuencoded we
-have decoded it for the wider audience in <a href="vanschnitz.alt.c">vanschnitz.alt.c</a>. The
+have decoded it for the wider audience in <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1995/vanschnitz/vanschnitz.alt.c">vanschnitz.alt.c</a>. The
 <code>uuencode</code>d blob is still available in their remarks below. They encourage you
 to first try and figure out the program without the spoiler.</p>
 <h3 id="alternate-build">Alternate build:</h3>
@@ -227,7 +227,7 @@ the resulting program (on a Unix system) is to do the command</p>
 solution wherein the disks end up on peg 2; for an even
 number of disks, they will end on peg 3. This should
 provide some hint as to what sort of algorithm is used.</p>
-<p>We have included a <a href="spoiler.c">spoiler</a> version of the program, with
+<p>We have included a <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1995/vanschnitz/spoiler.c">spoiler</a> version of the program, with
 meaningful symbol names and comments, but we encourage you
 to try to decipher the program without it…</p>
 <pre><code>    begin 444 spoiler.c