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Add EXPOSE  to tell container users which port to use. Also good for docker ps.

Changed readme according to SWAG-1.8.0-ls10 which renders parts of the proxy conf pointless and can cause issues with newer versions of SWAG.

Removed volume for certs and keys and environment variables for certs and keys. Turns out, after talking to the dev, that they're not needed for this setup

Removed `RUN     node ./script/update-config.js` as it didn't actually do anything.