Add better contributing guide in the README.
Add contributing guide to the site header.
Converted chapter 0 of previous attempt to markdown.
Removed profanity from ch0.md (prev attempt).
Add more content to the index page.

* Excerpt from the previous book.
* Better introductory section.
Merge branch 'f/pharpend/contrib-guide' into develop
Better build automation.

The ./build script is no longer dangerous! It will also give you
instructions. It requires that you have a ghp/ directory in the project root,
which will house your gh-pages branch. As to avoid namespace conflicts, that
folder is ignored by this repo now.
Switch to "readable" Bootstrap theme.
Fixed webchat link.
Fixed some contributing info in the README.
Merge branch 'f/pharpend/btrauto' into develop
Merge pull request #7 from pharpend/develop

Added contributing guide to the README, a bunch of stuff to the home page