docs: Drop AUTHORS file in favour of git log

The git log (which didn’t exist when this file was written), and
copyright statements, give credit to these original developers.

Listing their names and e-mail addresses so prominently seems like a
recipe for random people to try e-mailing them for support.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

AUTHORS

@@ -1,40 +0,0 @@
-Below are just a few of the people who have contributed
-to GLib. Please don't mail these people about problems you
-have with GLib; see the README.md file for information about
-filing bugs and submitting changes.
-
-GLib-2.0 Team
--------------
-Hans Breuer        <hans@breuer.org>
-Matthias Clasen    <mclasen@redhat.com>
-Tor Lillqvist      <tml@iki.fi>
-Tim Janik          <timj@gtk.org>
-Havoc Pennington   <hp@redhat.com> 
-Ron Steinke        <rsteinke@w-link.net>
-Owen Taylor        <otaylor@redhat.com>
-Sebastian Wilhelmi <seppi@seppi.de>
-
-GLib-1.2 Team
--------------
-Shawn T. Amundson  <amundson@gimp.org>
-Jeff Garzik        <jgarzik@pobox.com>
-Raja R Harinath    <harinath@cs.umn.edu>
-Tim Janik          <timj@gtk.org>
-Elliot Lee         <sopwith@redhat.com>
-Tor Lillqvist      <tml@iki.fi>
-Paolo Molaro       <lupus@debian.org>
-Havoc Pennington   <hp@pobox.com>
-Manish Singh       <yosh@gimp.org>
-Owen Taylor        <otaylor@gtk.org>
-Sebastian Wilhelmi <wilhelmi@ira.uka.de>
-
-The random number generator "Mersenne Twister", which is used by GLib,
-was developed and originally coded by:
-Makoto Matsumoto   <matumoto@math.keio.ac.jp>
-Takuji Nishimura   <nisimura@math.keio.ac.jp>
-
-Original Authors
-----------------
-Peter Mattis       <petm@xcf.berkeley.edu>
-Spencer Kimball    <spencer@xcf.berkeley.edu>
-Josh MacDonald     <jmacd@xcf.berkeley.edu>