Remove version from docker-compose

[jonespm]

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Expected behavior (A description of what you expected to happen) :

No warning messages displayed starting up

Describe the bug (Tell us what happens instead of the expected behavior) :

There's a warning now when starting locally on Docker of

WARN[0000] /Users/jonespm/git/my-learning-analytics/docker-compose.yml: `version` is obsolete

Currently just a WARN but might cause an issue in the future. Only affects local development.

Steps to Reproduce :

1. Locally run docker compose up

Additional context (Add any other context about the problem here) :

https://github.com/compose-spec/compose-spec/blob/main/spec.md#version-and-name-top-level-elements