Worked exercise using the MAX_DATA parameter, highlighting its
incompleteness. Includes completed examples in /golden subdirectory.
Also some formatting changes for spacing and extra links.
Primarily addressing Nak's comments on the PR first.
Of note is the change from separate files to a single file.
Changed to boolector engine and bmc by default.
Updated install instructions to move z3 to optional and boolector to
recommended.
Literal code includes use :lines: option.