Remove obsolete field from docker-compose.yml

[krysal]

Description

Every time a just command involving docker is run, you get a warning:

According to documentation, it can be safely removed.

This PR also removes some unused imports from the file defining API URLs.

Testing Instructions

Compare this branch with main looking at the output of the just api/up, for example.

Checklist

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[AetherUnbound]

This is related to #4046, and it seems there may be some other work that's necessary in order to close that issue.

[sarayourfriend]

@AetherUnbound Can you specify what additional work is needed based on the issue? If this PR works in CI and locally, then I think we're good to go. There was some speculation that the compose file version changes might affect our existing usage, but it seems like they didn't 🤔 we were only using forward compatible features?

[sarayourfriend]

LGTM. CI passing is a good indication we're good to go here. Things work for me locally too, as far as I can tell!

[dhruvkb]

Approving because CI passes.

[dhruvkb]

Ah yes, unused imports are not caught in __init__.py. Good catch, @krysal!

[AetherUnbound]

There was some speculation that the compose file version changes might affect our existing usage, but it seems like they didn't 🤔

This was my only concern, based on the language you used in the other issue.