Remove requirements-docker.txt

[deece]

Background

This file needs to be maintained parallel to requirements.txt, but isn't, causes problems when new dependencies are introduced.

Instead, derive the Docker dependencies from the stock ones.

Changes

Remove the docker requirements file
Add a flag comment to requirements.txt
Update Dockerfile to remove content after the flag comment

Documentation

The flag comment in requirements.txt explains that content after it will be ignored for Docker

Test Plan

Rebuilt the docker image and confirmed autogpt executed and performed initial prompt processing

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes

[richbeales]

please fix the conflicts and then this can go in

[deece]

@richbeales Done :)