Adding first pass of boot_loaders docs

docs/boot_extlinux.md

@@ -1,2 +0,0 @@
-### Boot from extlinux
-TBA

docs/boot_grub.md

@@ -1,2 +0,0 @@
-### Boot from Grub
-TBA

docs/boot_loaders.md

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+### Boot as a Linux Kernel from Extlinux or Grub
+
+The ipxe.lkrn file can be booted as a Linux kernel from the bootloader.  This can be useful for providing a diagnostic tool as part of the OS or even having a quick option to reprovision the server on the fly.
+
+#### Booting from Extlinux
+
+Edit /boot/extlinux.conf and add a simple entry:
+
+    LABEL ipxe-boot
+          kernel /boot/ipxe.lkrn
+          initrd /boot/ipxe-config.ipxe
+
+The kernel is treated as a Linux kernel and the initrd is treated as the iPXE script that is run once the kernel has loaded.
+
+#### Booting from Grub
+
+

mkdocs.yml

@@ -1,8 +1,7 @@
 site_name: netboot.xyz
 pages:
 - [index.md, Home]
-- [boot_grub.md, Booting with..., Grub]
-- [boot_extlinux.md, Booting with..., Extlinux]
+- [boot_loaders.md, Booting with..., Extlinux/Grub]
 - [boot_vbox.md, Booting with..., Virtual Box]
 - [boot_vmware.md, Booting with..., VMware]
 - [boot_drac.md, Booting with..., Dell DRAC]