Request: Allow setting the front-end nginx configuration for subdirectory

[jjgmckenzie]

As it stands; (I believe) the nginx config does not support using /grocy as a subdirectory; and presumes that it will be hosted on its own subdomain.
This is different from grocy itself, which supports subdomains using GROCY_BASE_PATH and GROCY_BASE_URL

[jayaddison]

Hey @jjgmckenzie - thanks for the issue report. I'll be stepping back from maintenance of grocy-docker for a while to attempt to refocus; not a hugely helpful reply I'm afraid but I wanted to make sure your message had a response.