index: Stress book over build system

The build system has not seen any updates in the last two years. More
focus has been put into the book, so put the build system below the
book.

Signed-off-by: Philip Molloy <philip@philipmolloy.com>

Author: pamolloy

content/_index.md

@@ -3,10 +3,9 @@ title: Home
 ---
 
 LinuxBoot is the concept of using a Linux kernel and initramfs as a bootloader.
-
-The [`linuxboot`](https://github.com/linuxboot/linuxboot) repository contains a
-build system implementing LinuxBoot primarily targeting servers and PCs, which
-started as [*NERF*](https://trmm.net/NERF) in January 2017 at Google.
+It is an example of [multiple
+discovery](https://en.wikipedia.org/wiki/Multiple_discovery), having been
+implemented numerous times.
 
 ![](images/linuxboot_info.png)
 
@@ -24,10 +23,15 @@ started as [*NERF*](https://trmm.net/NERF) in January 2017 at Google.
 
 ## LinuxBoot Book 📖
 
-The official documentation for LinuxBoot is the [LinuxBoot Book](https://book.linuxboot.org),
-where you can find information on how LinuxBoot works, how to build the various
-flavours (e.g. coreboot/LinuxBoot or UEFI PEI/LinuxBoot), the
-[u-root](https://github.com/u-root/u-root) ramfs builder, etc.
+The official documentation for LinuxBoot is the [LinuxBoot
+Book](https://book.linuxboot.org), which documents LinuxBoot core concepts and
+the numerous implementations.
+
+## Build system
+
+The [`linuxboot`](https://github.com/linuxboot/linuxboot) repository contains a
+build system implementing LinuxBoot primarily targeting servers and PCs, which
+started as [*NERF*](https://trmm.net/NERF) in January 2017 at Google.
 
 ## Organization