improve Copyright and CC

The inc/footer.default.html now has a common Copyright and CC BY-SA
4.0 License section for all generated HTML files.

All markdown files have a similar Copyright and CC
at the bottom in the form of an HTML comment.

status.md

@@ -127,3 +127,18 @@ TZ=UTC ls -D '%FT%T+00:00' -ld status.json
 **Sorry**: It is possible that for some reason, the [status.json](status.json) file
 was modified without the content being changed.  While we will try to minimize
 the cases where this happen, we apologize in advance (Sorry tm Canada 🇨🇦) when it does.
+
+
+<!--
+
+    Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
+
+    You are free to share and adapt this file under the terms of this license:
+
+	Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+    For more information, see:
+
+	https://creativecommons.org/licenses/by-sa/4.0/
+
+-->