[config-support] Condensed generate feature scenarios
[config-support] Condensed generate feature scenarios

I created three piecemeal scenarios as I implemented the three
distinct parts of configuration, and this pulls those three together
into a single scenario where a config.toml is supplied.

I am now checking for the "sensible defaults" in the original scenario
where no config.toml is supplied.

jedcn/reveal-ck,jedcn/reveal-ck,jedcn/reveal-ck