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

1988/isaak/index.html

@@ -160,7 +160,7 @@ code</a> below.</p>
 <h2 id="to-use">To use:</h2>
 <pre><code>    ./isaak</code></pre>
 <h2 id="alternate-code">Alternate code:</h2>
-<p>The original version of this code is in <a href="isaak.alt.c">isaak.alt.c</a>.
+<p>The original version of this code is in <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1988/isaak/isaak.alt.c">isaak.alt.c</a>.
 The original entry starts with the line:</p>
 <pre><code>    main(){};</code></pre>
 <p>This works on some systems. Why? Note that <code>#include &lt;stdio.h&gt;</code> is given on
@@ -176,7 +176,7 @@ compile.</p>
 <p>The program relies heavily on ASCII. Don’t even think of running it on
 an EBCDIC machine.</p>
 <h3 id="historical-notes-about-the-original-entry">Historical notes about the original entry:</h3>
-<p>NOTE: If you named the file anything other than <a href="isaak.c">isaak.c</a>, you had to
+<p>NOTE: If you named the file anything other than <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1988/isaak/isaak.c">isaak.c</a>, you had to
 change the <code>#include</code> on line 6. This limitation has been fixed by using the
 <code>__FILE__</code> macro.</p>
 <p>NOTE: The use of null comments to separate macros to construct different tokens
@@ -188,7 +188,7 @@ file: isaak.encode. To read this file do.</p>
 <pre><code>    uudecode &lt; isaak.encode
     cat isaak.output</code></pre>
 <p>Since this was fixed, this file is not strictly necessary. See the
-<a href="isaak.alt.c">isaak.alt.c</a> for the original source.</p>
+<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1988/isaak/isaak.alt.c">isaak.alt.c</a> for the original source.</p>
 <p>FYI: We are likely to be more strict about portability in the future.</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <p>No remarks were provided by the author.</p>