Described content of just, though it should have a more explanatory name.
Elaborated on the project idea
Renamed just module to check for clarity

I would have liked to use the word test but it’s already used by the
unit testing parts so this is the next best. Though about using
‘error’, though the idiom where check methods return both value and err
would read really bad.
Removed sphinx related docs
Added controller and handler to glossary