update index.html and .entry.json per recent manifest changes

Every index.html file (for entries) was updated as the tarball download
description was changed to 'download entry source' (though I think this
is a mistake as the C file is described as 'entry source' so it's
ambiguous - that might be fixed soon or it mightn't be until some other
changes are made that need a manifest update).

1991/cdupont/index.html

@@ -168,7 +168,7 @@ https://creativecommons.org/licenses/by-sa/4.0/</p>
 <li><a href="index.html">index.html</a> - entry home page</li>
 <li><a
 href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/cdupont/cdupont.c">cdupont.c</a>
-- winning source</li>
+- entry source</li>
 <li><a
 href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/cdupont/Makefile">Makefile</a>
 - entry Makefile</li>
@@ -176,7 +176,7 @@ href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/cdupont/Make
 href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/cdupont/cdupont.orig.c">cdupont.orig.c</a>
 - original source</li>
 <li><a href="1991_cdupont.tar.bz2">1991_cdupont.tar.bz2</a> - download
-winning source</li>
+entry source</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>