fix bin/gen_top_html

Fix `bin/gen_top_html` to generate the proper Nu HTML check URLs.

Changed `bin/gen_top_html` VERSION from "1.3 2024-04-14"
to "1.4 2024-04-15".

Remove improper "xmlns:cc="http://creativecommons.org/ns#"
from `inc/inc/footer.default.html`.

Run `make gen_top_html` to perform the above and test under macOS.

TODO: If this is successful, rebuild all other constructed HTML files.

CODE_OF_CONDUCT.html

@@ -268,7 +268,7 @@ https://www.contributor-covenant.org/translations.</p>
   <p>All IOCCC content including this file and web page are:</p>
   <b>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Copyright &copy; 1984-2024 by Landon Curt Noll. <a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean">Some Rights Reserved</a>.</b>
   <p>This work is licensed by Landon Curt Noll under:</p>
-  <p xmlns:cc="http://creativecommons.org/ns#" ><b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
+  <p><b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
   target="_blank" rel="license noopener noreferrer" style="display:inline-block;">&nbsp;&nbsp;&nbsp;&nbsp;CC BY-SA 4.0
   <img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
   src="./png/cc.png"
@@ -289,7 +289,7 @@ https://www.contributor-covenant.org/translations.</p>
   <p>You may wish to review the <b><a href="./license.html">highlights of some of the key
   features and terms</a></b> of the <a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en">actual license</a>.</p>
   <h2>Coda</h2>
-  <p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2Flocation.html">Nu HTML check this web page</a></p>
+  <p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2FCODE_OF_CONDUCT.html">Nu HTML check this web page</a></p>
   <p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
 </div>