This PR moves some stuff around in our documentation. Most notably, it moves some sections out of the "Binary documentation" to become their own top-level sections. While doing so, it refactors a few things in options and statistics to be more agnostic to the way cvc5 is used. To allow for command-output being used in regular (not auto-generated) documentation, we add a new extension that takes care of injecting the build folder into a new wrapper run-command.
