remove pgpring from docs

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-.\" -*-nroff-*-
-.\"
-.\"     pgpring, a key ring dumper
-.\"     Manpage Copyright (c) 2004-2013 Matthew Wilcox, Honza Horak
-.\"
-.\"     This program is free software; you can redistribute it and/or modify
-.\"     it under the terms of the GNU General Public License as published by
-.\"     the Free Software Foundation; either version 2 of the License, or
-.\"     (at your option) any later version.
-.\"
-.\"     This program is distributed in the hope that it will be useful,
-.\"     but WITHOUT ANY WARRANTY; without even the implied warranty of
-.\"     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-.\"     GNU General Public License for more details.
-.\"
-.\"     You should have received a copy of the GNU General Public License
-.\"     along with this program; if not, write to the Free Software
-.\"     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-.\"
-.TH pgpring 1 "May 2013" Unix "User Manuals"
-.SH NAME
-pgpring \- NeoMutt key ring dumper
-
-.SH SYNTAX
-.PP
-\fBpgpring\fP [ \fB\-k\fP \fIkeyring\fP ] [ \fB\-2\fP | \fB\-5\fP ]
-[ \fB\-s\fP ] [ \fB\-S\fP ] [ \fB\-f\fP ]
-
-.SH DESCRIPTION
-.PP
-pgpring is a key ring dumper.  It extracts information from PGP's
-binary key ring and emits it in an (almost) readable output format
-understood by neomutt's key selection routines.  This output format
-mimics the one used by the GNU Privacy Guard (GPG).
-
-.SH OPTIONS
-.TP
-.BI \-k " keyring"
-Dump the contents of the specified keyring.
-.TP
-.B \-2
-Use the default keyring for PGP 2.x.
-.TP
-.B \-5
-Use the default keyring for PGP 5.
-.TP
-.B \-s
-Dump the secret keyring.
-.TP
-.B \-S
-Dump signatures.
-.TP
-.B \-f
-Dump fingerprints.
-
-.SH ENVIRONMENT
-.PP
-.IP "HOME"
-Full path of the user's home directory.
-.IP "PGPPATH"
-Directory in which the user's PGP public keyring can be found.
-
-.SH AUTHORS
-Thomas Roessler <roessler@does\-not\-exist.org>
-