Also updated the GitHub project description to:
"Learn the Zig programming language by fixing tiny broken programs."
I think it sounds more of a fun challenge this way rather than the more
academic "learn by doing exercises".
I mean, who wouldn't want to come help these "tiny broken programs"?!?
I'm changing the order of some more topics. Trying to explain the value
of pointers when we're mostly dealing with stack-sized values like
integers feels convoluted. So I'm starting with enums (which also has a
nice segue from an earlier "switch" exercise). Then structs. Then unions
(just in keeping with the order of these items on ziglearn.org) and THEN
pointers and multi-pointers and slices.