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

2001/bellard/index.html

@@ -176,7 +176,7 @@ program.</p>
 <pre><code>    ./bellard bellard.c [args]...</code></pre>
 <p>or by giving the C source to its standard input.</p>
 <p><code>args</code> are given to the <code>main()</code> function of <code>bellard.c</code> (<code>argv[0]</code> is
-<a href="bellard.c">bellard.c</a>).</p>
+<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2001/bellard/bellard.c">bellard.c</a>).</p>
 <h3 id="examples">Examples:</h3>
 <ul>
 <li>Sample compilation and execution:</li>