Generalize

[srid]

AFAICT, the only thing that preventing us from not keeping this Juspay-specific is the git-email here:

nixone/setup.sh

Line 19 in b4907bb

--params '{"username":"'$(id -un)'", "git-name":"'$(id -un)'", "git-email":"'$(id -un)'@juspay.in"}'

I do wonder if there is a way to get this juspay.in somehow (in a Juspay provided macbook), and then use that - whilst falling back to placeholder email or something.

[srid]

Once we do this, we should be use this as the recommended "Tip" for cases like juspay/omnix#402