Add support for Athena OS (#3689)

Author: longpanda

INSTALL/grub/grub.cfg

@@ -732,6 +732,8 @@ function uefi_linux_menu_func {
                     vt_add_replace_file $vtindex "arch\\boot\\x86_64\\initramfs-linux.img"
                 elif [ -f (loop)/boot/initramfs_x86_64.img ]; then
                     vt_add_replace_file $vtindex "boot\\initramfs_x86_64.img"
+                elif [ -f (loop)/arch/boot/x86_64/initramfs-linux-aegis-offensive.img ]; then
+                    vt_add_replace_file $vtindex "arch\\boot\\x86_64\\initramfs-linux-aegis-offensive.img"
                 fi
             elif [ -d (loop)/blackarch ]; then
                 if [ -f (loop)/blackarch/boot/x86_64/archiso.img ]; then