Move standalone qvm-sync-appmenus to core-dom0-linux

It makes no sense to leave standalone tool here while real code is moved
to core-dom0-linux. Also move its manpage.

doc/qvm-tools/qvm-sync-appmenus.rst

@@ -1,26 +0,0 @@
-=================
-qvm-sync-appmenus
-=================
-
-NAME
-====
-qvm-sync-appmenus - updates desktop file templates for given StandaloneVM or TemplateVM
-
-:Date:   2012-04-11
-
-SYNOPSIS
-========
-| qvm-sync-appmenus [options] <vm-name>
-
-OPTIONS
-=======
--h, --help
-    Show this help message and exit
--v, --verbose
-    Run in verbose mode 
- 
-AUTHORS
-=======
-| Joanna Rutkowska <joanna at invisiblethingslab dot com>
-| Rafal Wojtczuk <rafal at invisiblethingslab dot com>
-| Marek Marczykowski <marmarek at invisiblethingslab dot com>

dom0/qvm-tools/qvm-sync-appmenus

@@ -1,2 +0,0 @@
-#!/bin/sh
-exec /usr/lib/qubes/qubes-receive-appmenus $@