Remove duplicate yaml file
Update rakefile to allow environments other than production

This was for testing purposes (being able to add things to the dev
manifest) and it makes sense to have it be more flexible.  Plan to
automate the process of establishing a development environment, this
will facilitate better feature tests as well.
Add manifests to git

This works for my purposes now but needs a better solution if anyone
were to ever clone and try to use it.
Fix bottom padding on fenced code blocks
Use sinatra url helper for stylesheet
Fix fenced code block indenting issues