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

1991/rince/index.html

@@ -160,10 +160,10 @@ that’s fewer than the original program.</p>
 <h2 id="to-use">To use:</h2>
 <pre><code>    ./rince</code></pre>
 <h2 id="alternate-code">Alternate code:</h2>
-<p>The first alternate version, <a href="rince.alt.c">rince.alt.c</a>, disables a maximum move
+<p>The first alternate version, <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/rince/rince.alt.c">rince.alt.c</a>, disables a maximum move
 count so that anyone with enough patience and time can complete the puzzle,
 without having to worry about how many moves they make, assuming they don’t get
-stuck. The second version, <a href="rince.alt2.c">rince.alt2.c</a>, allows one to
+stuck. The second version, <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/rince/rince.alt2.c">rince.alt2.c</a>, allows one to
 reconfigure at compilation the maximum number of moves, even if that is lowering
 the count.</p>
 <p>The author set the maximum number of moves to 484.</p>