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

1998/dorssel/index.html

@@ -176,7 +176,7 @@ what values may they be changed without altering the behavior?</p></li>
 altering the behavior ?</p></li>
 </ul>
 <h3 id="extra-credit">Extra credit:</h3>
-<p>Try doing what the last part of the last command in <a href="try.sh">try.sh</a> suggests.
+<p>Try doing what the last part of the last command in <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/dorssel/try.sh">try.sh</a> suggests.
 As in, do the following:</p>
 <pre><code>    echo &quot;. -..- . .-. -.-. .. ... .
     -.-. .... .- -. --. .  - .... .  .--. .-. --- --. .-. .- --  ... ---  .. -  -.. --- . ...  -. --- -  ... .... --- ..- -&quot; | ./dorssel</code></pre>
@@ -218,7 +218,7 @@ text that can be reversibly Morsified, i.e.</li>
 <p>is the same as</p>
 <pre><code>    ./dorssel &lt; dorssel.c | ./dorssel</code></pre>
 <ul>
-<li>The file <a href="dorssel.md">dorssel.md</a> contains all the information needed to
+<li>The file <a href="dorssel.html">dorssel.html</a> contains all the information needed to
 understand this program. For an obfuscated spoiler, try</li>
 </ul>
 <pre><code>    ./dorssel &lt; dorssel.md</code></pre>