Import pydoctheme and apply to docs
Edit indexcontent.html
Move whatsnew documents to their own section
Update index files for whatsnew section move
Rework build instructions
Change back to full-width documentation
Update quick-start/install guide
Documentation improvements
Add version.info for easier bug reporting
Fix issues in build.rst
Merge pull request #344 from andrewcollette/docs

Documentation improvements for 2.2.0