[ENH] Update environment variables and remove deprecated version tag

[alyssadai]

• Closes remove version tag in docker-compose.yml #56
• Closes Remove configurable NB_GRAPH_ROOT_HOME from template.env #62
• Closes Add authentication-related environment variables #63
• Closes Add NB_FEDERATE_REMOTE_PUBLIC_NODES to docker-compose.yml #64

Changes proposed in this pull request:

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[surchs]

Thanks @alyssadai, looks good.
The changes that relate to auth need a clarification that auth is under active development and unless you are deploying nightly/developing yourself you can ignore them for now.

We don't want folks who are making deployments now (as e.g. workshop attendees will probably do) to get confused.

I'll still approve it, but please take a look at these comments first and then 🧑‍🍳

[surchs]

Like below, I think we should clarify here that these variables are not (yet) needed for prod deployments because auth is under active development still. Not sure how to best do that. Maybe you have a good idea?

[alyssadai]

How about in parentheses at the start of the description (Experimental, for dev deploments only) / (PREVIEW) ? Or something similar

[alyssadai]

Will use (Experimental, for dev deployments only) for now :)

[neurobagel-bot]

🚀 PR was released in v0.0.1 🚀