Add in neverReplaceExec and several rules for it

[revans2]

This extends the great work done in #647 but fixes an issue there where we were still outputting config documentation for execs we never plan to replace.

I also made adding one of these in simpler and more common. I then added in rules for all of the other commands we currently don't want to warn about or ever replace.

This fixes #499

[revans2]

build

[andygrove]

Thanks, that's much nicer. LGTM.

[jlowe]

fixes an issue there where we were still outputting config documentation for execs we never plan to replace.

Curious, I expected to see some deletes in configs.md as part of this. Did we miss the configs.md changes from the previous PR somehow?

[revans2]

Curious, I expected to see some deletes in configs.md as part of this. Did we miss the configs.md changes from the previous PR somehow?

Yup if there had been there I would not have approved it, but they showed up afterward for me as a part of another build, so I thought why not fix it and also knock out #499 too while I was at it.

[jlowe]

We probably need a CI check for docs being modified during the build (maybe any checked out file being modified?), indicating PR should have included some changes that are missing. I'll file an issue.