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.

2000/rince/README.md

@@ -81,7 +81,7 @@ Julian day number (given as a fractional component). E.g.:
 A Julian day is defined to be the number of days since January 1st in the year
 `-4712 (4713BC)`, starting at 12 noon GMT.[^1][^2] To aid conversion from our time
 (GMT) to Julian day there is a supplementary program named:
-[dmy2jd.c](dmy2jd.c). Run it with `day_float month year` as arguments. See below
+[dmy2jd.c](%%REPO_URL%%/2000/rince/dmy2jd.c). Run it with `day_float month year` as arguments. See below
 for an example.
 
 

2000/rince/index.html

@@ -417,7 +417,7 @@ Julian day number (given as a fractional component). E.g.:</p>
 <p>A Julian day is defined to be the number of days since January 1st in the year
 <code>-4712 (4713BC)</code>, starting at 12 noon GMT.<a href="#fn1" class="footnote-ref" id="fnref1" role="doc-noteref"><sup>1</sup></a><a href="#fn2" class="footnote-ref" id="fnref2" role="doc-noteref"><sup>2</sup></a> To aid conversion from our time
 (GMT) to Julian day there is a supplementary program named:
-<a href="dmy2jd.c">dmy2jd.c</a>. Run it with <code>day_float month year</code> as arguments. See below
+<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/rince/dmy2jd.c">dmy2jd.c</a>. Run it with <code>day_float month year</code> as arguments. See below
 for an example.</p>
 <h3 id="what-it-does">What it does</h3>
 <p>This program plots the positions of the four <a href="https://en.wikipedia.org/wiki/Galilean_moons">Galilean