Split the source markdown into chapters (to start #194)
New index.md was not formatted correctly
Make sure the images can be found when viewing the Markdown
directly and when building the non-HTML versions.
By creating a concatenated Markdown version first, we can build all of the
output types we want relative to the root and still keep the chapters in their
own directory.
Rebuilt the index.html for comparison
Merge pull request #276 from wibblymat/split-chapters

Split the source markdown into chapters (Fixes #194)