Created Update/Config part (#1191)

same as you did for vaultwarden or for my first attempt on adguard.

to keep alpine in line with your other code, I made this.

I also added the ability to let the user configure the IP on which the service is listening to

ct/alpine-adguard-v5.sh

@@ -338,7 +338,6 @@ function install_script() {
 ARCH_CHECK
 PVE_CHECK
 NEXTID=$(pvesh get /cluster/nextid)
-timezone=$(cat /etc/timezone)
 header_info
   if (whiptail --title "SETTINGS" --yesno "Use Default Settings?" --no-button Advanced 10 58); then
     header_info

ct/alpine-docker-v5.sh

@@ -338,7 +338,6 @@ function install_script() {
 ARCH_CHECK
 PVE_CHECK
 NEXTID=$(pvesh get /cluster/nextid)
-timezone=$(cat /etc/timezone)
 header_info
   if (whiptail --title "SETTINGS" --yesno "Use Default Settings?" --no-button Advanced 10 58); then
     header_info

ct/alpine-grafana-v5.sh

@@ -338,7 +338,6 @@ function install_script() {
 ARCH_CHECK
 PVE_CHECK
 NEXTID=$(pvesh get /cluster/nextid)
-timezone=$(cat /etc/timezone)
 header_info
   if (whiptail --title "SETTINGS" --yesno "Use Default Settings?" --no-button Advanced 10 58); then
     header_info

ct/alpine-vaultwarden-v5.sh

@@ -338,7 +338,6 @@ function install_script() {
 ARCH_CHECK
 PVE_CHECK
 NEXTID=$(pvesh get /cluster/nextid)
-timezone=$(cat /etc/timezone)
 header_info
   if (whiptail --title "SETTINGS" --yesno "Use Default Settings?" --no-button Advanced 10 58); then
     header_info

ct/alpine-zigbee2mqtt-v5.sh

@@ -338,7 +338,6 @@ function install_script() {
 ARCH_CHECK
 PVE_CHECK
 NEXTID=$(pvesh get /cluster/nextid)
-timezone=$(cat /etc/timezone)
 header_info
   if (whiptail --title "SETTINGS" --yesno "Use Default Settings?" --no-button Advanced 10 58); then
     header_info