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* Make dependencies that are only used inside experiment/gym
containers optional
(for all dependencies install via ``pip install beobench[extended]``)
* Add two part experiment image build process so that there is shared beobench
installation dockerfile
* Add support for yaml config files (!)
* Overhaul of documentation, including new envs page and new theme
* Enable RLlib free experiment containers when not required
* Add beobench_contrib as submodule
* Simplify Pypi readme file
* Remove GPU requirement for devcontainer