Support http-configurable and nginx reverse proxy

[hungdinhxuan]

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[manics]

Thanks for the PR! I think it'd be good to keep the basic example as simple as possible, but this would make a nice second example. Would you mind adding a new directory (you can probably just copy all the files from basic-example into that new directory), and add the directory to the test matrix? https://github.com/jupyterhub/jupyterhub-deploy-docker/blob/e31f3a5c9e12cb2d3e9fd30d9ec484ddf53c0c31/.github/workflows/test.yml#L31-L34