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.

2018/mills/README.md

@@ -526,10 +526,10 @@ contest scheduling, I chose not to wait for the actual 50th anniversary).
 I had thought of writing self-hosting compilers for a stripped-down version of
 C, or maybe even a version of the B language...  At the same time, I was
 obsessed with the idea of allowing [mullender.c from
-1984](../../1984/mullender/index.html) to run.  Although
+1984](%%REPO_URL%%/1984/mullender/index.html) to run.  Although
 that was still a possibility on an interpreted version of B or a stripped-down
 version of C, it felt cheap, as it would be
-[mullender.c](../../1984/mullender/mullender.c) only in spirit.
+[mullender.c](%%REPO_URL%%/1984/mullender/mullender.c) only in spirit.
 
 It was during this time that I discovered that in 2016, members of the Unix
 Heritage Society got access to [printouts of assembly-language source for the
@@ -793,7 +793,7 @@ time...
 
 <hr style="width:10%;text-align:left;margin-left:0">
 
-[1]:  ../../1984/mullender/mullender.c            "mullender.c"
+[1]:  %%REPO_URL%%/1984/mullender/mullender.c            "mullender.c"
 [2]:  http://minnie.tuhs.org/cgi-bin/utree.pl?file=2.9BSD    "2.9 BSD"
 [3]:  https://www.bell-labs.com/usr/dmr/www/kbman.html       "B Language"
 [4]:  https://www.bell-labs.com/usr/dmr/www/hist.html        "UNIX history"

2018/mills/index.html

@@ -516,7 +516,7 @@ Let’s try some:</p>
     # bin/cc mullender.c
     # ./a.out</code></pre>
 <p>The program you’ve just run was the [winning entry of the first IOCCC contest from
-1984] <a href="../../1984/mullender/mullender.c" title="mullender.c">1</a> (or was it 1894?), a personal favorite of mine. It is rather
+1984] <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1984/mullender/mullender.c" title="mullender.c">1</a> (or was it 1894?), a personal favorite of mine. It is rather
 tightly bound to running on either a PDP-11 or a VAX-11. Now you have one.</p>
 <p>Hitting Control-C will return you to the BSD UNIX prompt. Hitting Control-D
 will log you out of the single-user session and get you back to the <code>:login:</code>
@@ -748,11 +748,11 @@ emulator.</p>
 contest scheduling, I chose not to wait for the actual 50th anniversary).
 I had thought of writing self-hosting compilers for a stripped-down version of
 C, or maybe even a version of the B language… At the same time, I was
-obsessed with the idea of allowing <a href="../../1984/mullender/index.html">mullender.c from
+obsessed with the idea of allowing <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1984/mullender/index.html">mullender.c from
 1984</a> to run. Although
 that was still a possibility on an interpreted version of B or a stripped-down
 version of C, it felt cheap, as it would be
-<a href="../../1984/mullender/mullender.c">mullender.c</a> only in spirit.</p>
+<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1984/mullender/mullender.c">mullender.c</a> only in spirit.</p>
 <p>It was during this time that I discovered that in 2016, members of the Unix
 Heritage Society got access to [printouts of assembly-language source for the
 original version of UNIX] <a href="http://www.tuhs.org/Archive/Distributions/Research/McIlroy_v0/" title="V0 Scans">7</a>. With what was a [huge amount of work] <a href="https://web.archive.org/web/20180826162445/https://minnie.tuhs.org//Y5/wkt_hapop_paper.pdf" title="UNIX v0">8</a>,