Adding bitbucket instructions

They instructions would also work for GitHub pages I believe, and I also believe they are simpler (at least it was for me).
I would put the example in a separate paragraph, and not use code (triple backticks). Filenames should be marked up with &lt;span class="filename">Users/me/git/mynanoc_build_env&lt;/span>.

The directory names are confusing. What is “env”? Perhaps better names would be _mysite_ and _mysite-compiled_.