npm / cli / #3297

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fix(help|edit): use npm.exec, use file:///

Windows no longer allows `file://`, but instead requires `file:///` for
local file urls.

Also after the command refactor things shifted and the tests didn't
catch that the help pages didn't work at all anymore, and that the
post-edit rebuild didn't work. This cleans up those two issues.

PR-URL: https://github.com/npm/cli/pull/3994
Credit: @wraithgar
Close: #3994
Reviewed-by: @lukekarrys

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