Split documentation into multiple subpages
Remove single-page tutorial
Minor tweaks
Move stuff around a bit
Fix cross references and update vision history
Remove old entries from revision history

These don't make much sense any more, as mypy has changed a lot since
these were written.
Move union types to section 'Kinds of types'
Wrap long lines
Use ``...`` to format code within normal text
Minor update to faq
Improvements to built-in type docs
Minor documentation changes
Update common issues documentation
Some FAQ fixes
Add introduction to library stubs
Add short introduction
Add introduction to the chapter Basics
Add more discussion of dynamic typing
Discuss typevar value in the documentation
Add documentation on ducktype decorator