Update URL to https://tuxpaint.org/ everywhere

Also, add other social media accounts to list of places to
announce Tux Paint in RELEASE docs.

Also, list a ton more options missing from default example config file
"src/tuxpaint.conf"

src/tuxpaint.conf

@@ -4,15 +4,40 @@
 # See tuxpaint(1) or run 'tuxpaint --help' for details on using Tux Paint
 #
 # Bill Kendrick <bill@newbreedsoftware.com>
-# http://www.tuxpaint.org/
+# https://tuxpaint.org/
 #
 # Default distribution version last modified:
-# July 25, 2020
+# December 11, 2020
 # 
 # $Id$
 
 
-# FIXME: Add alllocalefonts, allowscreensaver, stampsize, datadir, nolockfile -bjk 2010.04.15
+# FIXME: Add descriptions & examples for other options:
+#  * allowscreensaver
+#  * buttonsize
+#  * startblank
+#  * nobuttondistinction
+#  * hidecursor
+#  * nostampcontrols
+#  * nostamprotation
+#  * nomagiccontrols
+#  * noshapecontrols
+#  * nolabel
+#  * nobrushspacing
+#  * newcolorslast
+#  * colorsrows
+#  * onscreenkeyboard
+#  * " layout
+#  * " disable change
+#  * joystick*
+#  * stampsize
+#  * nosysfonts
+#  * stampsize
+#  * alllocalefonts
+#  * datadir
+#  * reversesort
+#  * nolockfile
+# -bjk 2022.12.11
 
 
 # The variables described below are initially commented out.