* Move top-level markdown source to root, to avoid dead link issue in mdbook

Author: chrivers

book/src/SUMMARY.md

@@ -1,6 +1,6 @@
 # Getting started
-- [Introduction](intro/index.md)
-- [Installling Raptor](intro/install.md)
+- [Introduction](intro.md)
+- [Installling Raptor](install.md)
 
 ---
 

book/src/intro/install.md book/src/install.mdbook/src/intro/install.md renamed to book/src/install.md

@@ -12,7 +12,7 @@ It uses `systemd-nspawn` for sandboxing when building or running containers.
 
 ~~~admonish tip title="~Eagle..~ err, eager to get started?"
 Start by [installing raptor](install.md), then head over to the
-[Debian Liveboot walkthrough](/walkthrough/debian/index.md) to get a
+[Debian Liveboot walkthrough](walkthrough/debian/index.md) to get a
 hands-on introduction to building a bootable iso.
 ~~~
 
@@ -22,7 +22,7 @@ Raptor builds *layers* from *`.rapt`* files. If you are familiar with Docker,
 this is similar to how Docker builds *containers* from a *`Dockerfile`*.
 
 ~~~pikchr
-{{#include ../images/raptor-layers.pikchr}}
+{{#include images/raptor-layers.pikchr}}
 ~~~
 
 However, Raptor has a different scope, and can do considerably different things