add checkmark to the narbar of all constructed HTML

We added a checkmark all narbar's that has the make effect of
clicking on the **Nu HTML check this web page** link at the very
bottom.  This makes it much more convenient when one needs
to quickly check the HTML of a number of web pages.

Run `make www` to perform the above.

1991/ant/index.html

@@ -127,6 +127,7 @@
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/ant/ant.c">C code</a>
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/ant/Makefile">Makefile</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1991%2Fant%2Findex.html">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.first.html -->

1991/brnstnd/index.html

@@ -127,6 +127,7 @@
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/brnstnd/brnstnd.c">C code</a>
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/brnstnd/Makefile">Makefile</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1991%2Fbrnstnd%2Findex.html">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.mid.html -->

1991/brnstnd/sorta.README.html

@@ -122,6 +122,7 @@
 
 <div class="navbar">
   <a class="Left" href="index.html">&uarr; jump to index.html &uarr;</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=#">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.up2index.html -->

1991/buzzard/index.html

@@ -127,6 +127,7 @@
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/buzzard/buzzard.c">C code</a>
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/buzzard/Makefile">Makefile</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1991%2Fbuzzard%2Findex.html">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.mid.html -->

1991/cdupont/index.html

@@ -127,6 +127,7 @@
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/cdupont/cdupont.c">C code</a>
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/cdupont/Makefile">Makefile</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1991%2Fcdupont%2Findex.html">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.mid.html -->

1991/davidguy/index.html

@@ -127,6 +127,7 @@
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/davidguy/davidguy.c">C code</a>
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/davidguy/Makefile">Makefile</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1991%2Fdavidguy%2Findex.html">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.mid.html -->

1991/dds/index.html

@@ -127,6 +127,7 @@
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/dds/dds.c">C code</a>
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/dds/Makefile">Makefile</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1991%2Fdds%2Findex.html">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.mid.html -->

1991/fine/index.html

@@ -127,6 +127,7 @@
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/fine/fine.c">C code</a>
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/fine/Makefile">Makefile</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1991%2Ffine%2Findex.html">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.mid.html -->

1991/index.html

@@ -125,6 +125,7 @@
   <a class="Left" href="../years.html">&uarr; top &uarr;</a>
   <a class="Left" href="../1992/index.html">1992 &rarr;</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1991%2Findex.html">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.year.mid.html -->

1991/rince/index.html

@@ -127,6 +127,7 @@
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/rince/rince.c">C code</a>
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/rince/Makefile">Makefile</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1991%2Frince%2Findex.html">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.mid.html -->

1991/westley/index.html

@@ -127,6 +127,7 @@
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/westley/westley.c">C code</a>
   <a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1991/westley/Makefile">Makefile</a>
   <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1991%2Fwestley%2Findex.html">&#x2713;</a>
 </div>
 
 <!-- END: this line ends content from: inc/navbar.last.html -->