Fix references to thanks-for-fixes -> help

As the thanks-for-fixes.md file was renamed (at my suggestion)
thanks-for-help.md I have made sure that the file referred to in the
repo is thanks-for-help and that the text regarding it also refers to
help and not fixes ('Thanks for the fixes' -> 'Thanks for the help').

inc/md2html.cfg

@@ -148,7 +148,7 @@
 /index.md				-H topnav=. -o inc/subst.default.sh
 /judges.md				-H topnav=. -o inc/subst.default.sh
 /news.md				-H topnav=. -o inc/subst.default.sh
-/thanks-for-fixes.md			-H topnav=. -o inc/subst.default.sh
+/thanks-for-help.md			-H topnav=. -o inc/subst.default.sh
 /winners.md				-H topnav=. -o inc/subst.default.sh
 /www-history.md				-H topnav=. -o inc/subst.default.sh
 /years.md				-H topnav=. -o inc/subst.default.sh

inc/sidenav.default.html

@@ -21,7 +21,7 @@
       <a href="%%DOCROOT_URL_SLASH%%faq.html#fix_a_winner">Fixing IOCCC winners</a>
       <a href="%%DOCROOT_URL_SLASH%%faq.html#fix_web_site">Fixing the web site</a>
       <a href="%%DOCROOT_URL_SLASH%%faq.html#fix_author">Fixing winner info</a>
-      <a href="%%DOCROOT_URL_SLASH%%thanks-for-fixes.html">Thanks for the fixes</a>
+      <a href="%%DOCROOT_URL_SLASH%%thanks-for-help.html">Thanks for the help</a>
     </div>
     <div class="sidenav">
       <a href="%%DOCROOT_URL_SLASH%%judges.html">The IOCCC Judges</a>