note old Email, header formatting, improve copyright and license

For the top level and year level README.md, where email are found,
a note was added to the effect that email addresses found above are
for historical purposes only, and should not be used today.

Old references to asking for fixes, comments, when content was used,
and next contest links were replaced with a general reference to the FAQ.

Harmonized the Copyright and License and copyright dates.
Now using Creative Commons "CC BY-SA 4.0 DEED Attribution-ShareAlike 4.0
International".

The above Creative Commons will become the standard for the IOCCC.
Replaced old `png/by-sa-3.0-88x31.png` with a new ` png/by-sa.88x31.png` icon.
Updated the top level HTML files to use the license.

1984/README.md

@@ -1,7 +1,7 @@
-# First Obfuscated C Code Contest
+# In 1984 the first annual Obfuscated C Code Contest was held
 
 In [1984](/years.html#1984), the first contest was held.  The name of the
-contest was simply "`Obfuscated C Code Contest`".
+contest was simply "`First annual Obfuscated C Code Contest`".
 
 Look at the `README.md`file for the given winning entry for information on how
 to compile it and how to run the winning program.  Look at the winning
@@ -15,10 +15,11 @@ were posted to [net.lang.c](https://groups.google.com/g/net.lang.c) and
 was announced in a [net.lang.c
 post](https://groups.google.com/g/net.lang.c/c/lx-TAuEyeRI/m/HdOOnNx6LC0J).
 
-=-=
 
-Copyright (c) 1984, Landon Curt Noll.
-All Rights Reserved.  Permission for personal, educational or non-profit use is
-granted provided this this copyright and notice are included in its entirety
-and remains unaltered.  All other uses must receive prior permission in writing
-from both Landon Curt Noll and Larry Bassel.
+# Copyright and License
+
+Copyright (c) 1984,2023, Landon Curt Noll. All Rights Reserved.
+This work is licensed under a [Creative Commons CC BY-SA 4.0 DEED Attribution-ShareAlike
+4.0 International](https://creativecommons.org/licenses/by-sa/4.0/) license.
+If you do use this work in some form, the [IOCCC judges](/judges.html) would appreciate
+(but does not require) if you were to [send us a note about your use](/contact.html).