Move image customization from site.mk to DSL

This should be according to:
https://gluon.readthedocs.io/en/latest/releases/v2023.2.html#image-customization

image-customization.lua

+-- Notes to ourselfs (from the past):
+-- activate for wifi fallback later in production
+--       gluon-ffbs-autoupdater-wifi-fallback
+
+features({
+	'web-advanced',
+	'web-osm',
+	'config-mode-geo-location-osm',
+	'mesh-vpn-parker',
+})
+
+packages({
+	'gluon-mesh-batman-adv-15',
+	'gluon-autoupdater',
+	'gluon-authorized-keys',
+	'gluon-config-mode-autoupdater',
+	'gluon-config-mode-core',
+	'gluon-config-mode-geo-location',
+	'gluon-config-mode-hostname',
+	'gluon-config-mode-mesh-vpn',
+	'gluon-config-mode-contact-info',
+	'gluon-web-admin',
+	'gluon-web-autoupdater',
+	'gluon-web-wifi-config',
+	'gluon-web-logging',
+	'gluon-radvd',
+	'gluon-setup-mode',
+	'gluon-status-page',
+	'gluon-web-private-wifi',
+	'iwinfo',
+	'gluon-web-network',
+	'wireguard-tools',
+	'kmod-wireguard',
+	'gluon-ffbsnext-nodeconfig',
+	'gluon-ffbsnext-nodeconfig-respondd',
+	'gluon-ffbsnext-debugbathosts',
+	'gluon-ffbsnext-debugrsyslog',
+	'gluon-ffbsnext-nextnode',
+	'gluon-ffbsnext-info-pull',
+	'gluon-ffbsnext-wireguard',
+	'usign',
+	'-gluon-ebtables-limit-arp',
+	'gluon-ebtables-filter-ra-dhcp',
+	'gluon-status-page-mesh-batman-adv',
+	'respondd',
+	'respondd-module-airtime',
+	'gluon-radv-filterd',
+	'kmod-nlmon',
+})
+
+-- support acpi shutdown for openwrt as VM
+if target('x86-generic') or target('x86-geode') or target('x86-64') then
+	featrues({
+		'kod-button-hotplug',
+	})
+end

site.mk

-GLUON_SITE_PACKAGES := \
-	gluon-mesh-batman-adv-15 \
-	gluon-autoupdater \
-	gluon-authorized-keys \
-	gluon-config-mode-autoupdater \
-	gluon-config-mode-core \
-	gluon-config-mode-geo-location \
-	gluon-config-mode-hostname \
-	gluon-config-mode-mesh-vpn \
-	gluon-config-mode-contact-info \
-	gluon-web-admin \
-	gluon-web-autoupdater \
-	gluon-web-wifi-config \
-	gluon-web-logging \
-	gluon-radvd \
-	gluon-setup-mode \
-	gluon-status-page \
-	gluon-web-private-wifi \
-	iwinfo \
-	gluon-web-network \
-	wireguard-tools kmod-wireguard \
-	gluon-ffbsnext-nodeconfig \
-	gluon-ffbsnext-nodeconfig-respondd \
-	gluon-ffbsnext-debugbathosts \
-	gluon-ffbsnext-debugrsyslog \
-	gluon-ffbsnext-nextnode \
-	gluon-ffbsnext-info-pull \
-	gluon-ffbsnext-wireguard \
-	usign \
-	-gluon-ebtables-limit-arp \
-	gluon-ebtables-filter-ra-dhcp \
-	gluon-status-page-mesh-batman-adv \
-	respondd \
-	respondd-module-airtime \
-	gluon-radv-filterd \
-	kmod-nlmon \
-
-
-#  activate for wifi fallback later in production
-#        gluon-ffbs-autoupdater-wifi-fallback
-
-#	gluon-ebtables-source-filter \
-#	gluon-ebtables-filter-multicast \
-#	gluon-alfred \
-#	gluon-mesh-vpn-fastd \
-
-GLUON_FEATURES := \
-	web-advanced \
-	web-osm \
-	config-mode-geo-location-osm \
-	mesh-vpn-parker
-
-# x86-generic
-ifeq ($(GLUON_TARGET),x86-generic)
-# support acpi shutdown for openwrt as VM
-GLUON_SITE_PACKAGES += \
-	kmod-button-hotplug
-endif
-
-# x86-64
-ifeq ($(GLUON_TARGET),x86-64)
-# support acpi shutdown for openwrt as VM
-GLUON_SITE_PACKAGES += \
-	kmod-button-hotplug
-endif
-
 # https://gluon.readthedocs.io/en/v2019.1.x/user/site.html#build-configuration
 GLUON_WLAN_MESH=11s
 
@@ -71,7 +5,6 @@ GLUON_WLAN_MESH=11s
 # see: https://gluon.readthedocs.io/en/latest/user/site.html#user-site-build-configuration
 GLUON_DEPRECATED=full
 
-
 DEFAULT_GLUON_RELEASE := $(shell ${GLUON_SITEDIR}/getRelease.sh)-$(shell date '+%Y%m%d')-snapshot
 
 # Allow overriding the release number from the command line