Added LAN Guidance in readme-vars.yml

[ItsMeRitch]

Resolves #7 for good.

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• [ x] I have read the contributing guideline and understand that I have made the correct modifications

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Description:

Myself and some other users reported issues with the software working out of the box on LAN only. This is resolved by commenting out the proxy_set_header in the nginx config. Adding some clear guidance on this would reduce issues opened and help future users

Benefits of this PR and context:

Increase satisfaction of userbase as more likely to work on simpler setups, eg, local networks without proxy

How Has This Been Tested?

Only Doc Change

Source / References:

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