fix many internal links

Fixed a number of internal links that need to
go to the GitHub site.

Ran `make www` to perform the above.

2019/duble/index.html

@@ -422,7 +422,7 @@ in the beginning this will also happen. This is discussed in
 directory which you’ll have to delete manually. This is also discussed in
 <a href="../../bugs.html#2019_duble">2019 duble bugs</a>.</p>
 <h2 id="alternate-code">Alternate code:</h2>
-<p>An alternate version of this entry, <a href="prog.alt.c">prog.alt.c</a>, is provided. This
+<p>An alternate version of this entry, <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.alt.c">prog.alt.c</a>, is provided. This
 alternate code might not work as well in macOS.</p>
 <h3 id="alternate-build">Alternate build:</h3>
 <pre><code>    make alt</code></pre>
@@ -510,8 +510,8 @@ with a different size!</strong></li>
 so any peer reaching the session should have a terminal with the same
 size or larger.</li>
 </ul>
-<h3 id="prog.c-vs-prog.alt.c"><a href="prog.c">prog.c</a> vs <a href="prog.alt.c">prog.alt.c</a></h3>
-<p>The file <a href="prog.alt.c">prog.alt.c</a> is the one I submitted.</p>
+<h3 id="prog.c-vs-prog.alt.c"><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.c">prog.c</a> vs <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.alt.c">prog.alt.c</a></h3>
+<p>The file <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.alt.c">prog.alt.c</a> is the one I submitted.</p>
 <p>The judges proposed a small update: the program was using macro <code>FD_SET</code> inside an
 expression, which breaks compilation on macOS. Wrapping this macro into a
 function was enough to fix this compilation issue.</p>
@@ -519,12 +519,12 @@ function was enough to fix this compilation issue.</p>
 the program you will see that it heavily relies on OS resources. And, for this
 first version of the program, you even needed to increase default <code>sysctl</code>
 parameters to make it work on FreeBSD (this was the purpose of file
-<a href="check-os.sh">check-os.sh</a>). I tried hard to tune macOS the same, but failed.</p>
+<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/check-os.sh">check-os.sh</a>). I tried hard to tune macOS the same, but failed.</p>
 <p>The simple fact the Judges proposed this update meant they wish it could work on
 Mac. And if the judges wish something, it <strong>has to</strong> be done. ;) So I
 refactored a little more the program to reduce OS resources consumption. Or
 maybe not reduce consumption, but consume them differently… And I obtained
-<a href="prog.c">prog.c</a>. With this version, no need to touch <code>sysctl</code> parameters, and
+<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/duble/prog.c">prog.c</a>. With this version, no need to touch <code>sysctl</code> parameters, and
 it works on macOS too! I must confess it was challenging to remain below the
 size limit with this little change.</p>
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