Remove unused security menu

roles/netbootxyz/templates/menu/security.ipxe.j2

@@ -1,29 +0,0 @@
-#!ipxe
-
-goto ${menu} ||
-
-:security_menu
-menu Security Distributions - Current Arch [ ${arch} ]
-iseq ${arch} x86_64 && set arch_a amd64 || set arch_a ${arch}
-item --gap Security Distributions
-{% for key, value in releases.items() | sort %}
-{% if value.enabled is defined and value.menu == "security" and value.enabled | bool %}
-item {{ key }} ${space} {{ value.name }}
-{% endif %}
-{% endfor %}
-choose menu || goto security_exit
-echo ${cls}
-goto ${menu} ||
-iseq ${sigs_enabled} true && goto verify_sigs || goto change_menu
-
-:verify_sigs
-imgverify ${menu}.ipxe ${sigs}${menu}.ipxe.sig || goto error
-goto change_menu
-
-:change_menu
-chain ${menu}.ipxe || goto error
-goto security_menu
-
-:security_exit
-clear menu
-exit 0