manual: remove the generate script, got obsoleted by CMake rules

Instead of running the manual/generate(1) script, "make manual" executes
the conversion tools.

diff --git a/manual/generate b/manual/generate
deleted file mode 100755 (executable)
index c6336ee..0000000
--- a/manual/generate
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/bin/sh
-##
-## This file is part of the PulseView project.
-##
-## Copyright (C) 2018 Soeren Apel <soeren@apelpie.net>
-##
-## 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, see <http://www.gnu.org/licenses/>.
-##
-
-echo "Trying to generate HTML output..."
-asciidoctor -a stylesheet=readthedocs.css -a stylesdir=asciidoctor-stylesheet-factory/stylesheets -a toc=left pulseview_manual.txt || exit
-echo " --> pulseview_manual.html OK"
-
-# Run asciidoctor-pdf only if it can be found in $PATH
-echo "Trying to generate PDF output..."
-type asciidoctor-pdf && asciidoctor-pdf -a stylesheet=readthedocs.css -a stylesdir=asciidoctor-stylesheet-factory/stylesheets pulseview_manual.txt || exit
-echo " --> pulseview_manual.pdf OK"