Update binary name, usage strings, generated file headers, tests,
and README. The generated BIND config header now includes the
install path: go install go.askask.com/catz@latest
Provide catz.yaml.example and zones.txt.example as starting points
for new users. The config follows RFC 9432's recommendation to use
"invalid." for SOA mname/rname. The zones file demonstrates all
supported features: single/multiple catalog assignment, group
property, coo property, and combinations.
