[feat] Add welcome/instruction wording to initial menu

setup/so-whiptail

@@ -295,8 +295,6 @@ whiptail_fleet_custom_hostname() {
 	whiptail_check_exitstatus $exitstatus
 }
 
-
-
 whiptail_requirements_error() {
 
 	local requirement_needed=$1
@@ -1152,7 +1150,20 @@ whiptail_you_sure() {
 
 	[ -n "$TESTING" ] && return
 
-	whiptail --title "Security Onion Setup" --yesno "Are you sure you want to continue a network install of Security Onion?" 8 75
+	read -r -d '' you_sure_text <<- EOM
+		Welcome to Security Onion Setup!
+
+		You can use Setup for lots of different use cases from a small standalone installation to a large distributed deployment for your enterprise.
+		
+		Setup uses keyboard navigation and you can use arrow keys to move around.  Certain screens may provide a list and ask you to select one or more items from that list.  You can use [SPACE] to select items and [ENTER] to proceed to the next screen.
+		
+		Would you like to continue?
+	EOM
+
+	whiptail \
+		--title "Security Onion Setup" \
+		--yesno "$you_sure_text" \
+		20 75
 
 	local exitstatus=$?
 	return $exitstatus