sg: remove useless env var from sg.config.yaml
Created by: mrnugget
I was just trying out Camden's dockerless sg
and ran into this again.
Pretty sure that I can trust past-me that the comment is correct and
that it's actually useless. We use INSECURE_DEV
in our app in some
places, but pretty sure rocket/syntect/http-server-stabilizer don't use
it.
Test plan
- Ran it locally