doc: cover environment variable support #1901
Merged
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Description
We had a couple spots in the documentation that mentioned the
SOPEL_CONFIGvar in passing, but no real documentation about it or the ability to override individual settings with envvars.Now we'll have a whole section (in the CLI chapter) about all supported environment variables.
This is forked off of #1900's WIP branch, so the first commit can be ignored for now. (GitHub may hide it from this PR once #1900 is merged, if its smarts hold up.)
Checklist
make qa(runsmake qualityandmake test)