Drop hypervisors from main

src/menu.ipxe

@@ -30,7 +30,6 @@ item local ${space} Boot from local hdd
 item --gap Operating Systems:
 item linux ${space} Linux Based
 item bsd ${space} BSD Based
-item hypervisors ${space} Hypervisors
 item --gap Tools:
 item utils ${space} Utilities
 item shell ${space} iPXE shell