Deprecate twitter

We further deprecate the use of twitter.

In cases such as historic guidelines and rules, we add
a note about using Mastodon.

In cases where a tweet URL was used, we replace with
an Internet Archive link because twitter has announced
that accounts that are not used for a period of time
will be deleted.

We add a few missing deprecated_twitter information
to the author.numbers and author.cvs files.

We remove references to twitter handles (after making
sure that both author.numbers and author.cvs has the
deprecated_twitter information).  When the "_README.md_"
files have their header information generated by
a tool, such deprecated_twitter data will not be present.

2018/guidelines.txt

@@ -42,6 +42,17 @@ ABOUT THIS FILE:
     Non-twitter users should force their browsers to reload the above URL
     to be sure they are seeing the most recent tweets.
 
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+An important 2023 update to this historic note:
+
+The IOCCC no longer uses twitter.  Today the IOCCC uses Mastodon.
+For more information and to see our IOCCC Mastodon posts, see:
+
+    https://fosstodon.org/@ioccc
+
+End of important 2023 update to this historic note.
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+
     While we try to post use news at:
 
         http://www.ioccc.org/index.html#news
@@ -779,6 +790,25 @@ JUDGING PROCESS:
     often accept their suggestions/comments about our remarks as well.
     This is done prior to posting the winners to the wide world.
 
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+An important 2023 update to how winners are announced
+
+The IOCCC no longer uses twitter.  IOCCC winners will be announced
+by a git commit to the IOCCC winners repo:
+
+	https://github.com/ioccc-src/winner
+
+that, in turn, updates the offivial IOCCC web site:
+
+	https://www.ioccc.org/index.html
+
+In addition a note is posted to the IOCCC Mastodon account:
+
+    https://fosstodon.org/@ioccc
+
+End of important 2023 update to how winners are announced.
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+
     Judging consists of a number of elimination rounds.  During a round,
     the collection of entries are divided into two roughly equal piles;
     the pile that advances on to the next round, and the pile that does
@@ -875,6 +905,17 @@ ANNOUNCEMENT OF WINNERS:
     Non-twitter users should force their browsers to reload the above URL
     to be sure they are seeing the most recent tweets.
 
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+An important 2023 update to this historic note:
+
+The IOCCC no longer uses twitter.  Today the IOCCC uses Mastodon.
+For more information and to see our IOCCC Mastodon posts, see:
+
+    https://fosstodon.org/@ioccc
+
+End of important 2023 update to this historic note.
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+
     The judges will then post an initial announcement of who won, the name
     of their award, and a very brief description of the winning entry
     on the IOCCC web site:
@@ -902,6 +943,25 @@ ANNOUNCEMENT OF WINNERS:
 
     We will also tweet, via @IOCCC, when the winning source is available.
 
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+An important 2023 update to how winners are announced
+
+The IOCCC no longer uses twitter.  IOCCC winners will be announced
+by a git commit to the IOCCC winners repo:
+
+	https://github.com/ioccc-src/winner
+
+that, in turn, updates the offivial IOCCC web site:
+
+	https://www.ioccc.org/index.html
+
+In addition a note is posted to the IOCCC Mastodon account:
+
+    https://fosstodon.org/@ioccc
+
+End of important 2023 update to how winners are announced.
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+
     It is pointless to ask the IOCCC judges how many entries we receive.
     Other government TLA or FLA snooping organizations are prohibited from
     either confirming, denying or revealing any knowledge of this data point.
@@ -948,6 +1008,17 @@ FOR MORE INFORMATION:
     Non-twitter users should force their browsers to reload the above URL
     to be sure they are seeing the most recent tweets.
 
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+An important 2023 update to this historic note:
+
+The IOCCC no longer uses twitter.  Today the IOCCC uses Mastodon.
+For more information and to see our IOCCC Mastodon posts, see:
+
+    https://fosstodon.org/@ioccc
+
+End of important 2023 update to this historic note.
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+
 Leonid A. Broukhis
 Simon Cooper
 chongo (Landon Curt Noll) /\cc/\