Docker implementation added

[StanleyOneG]

1. Ollama base_url in controller.py made dynamically pulled from .env file to be able to run ollama in docker container as well as locally

2. Dockerfile for bot modified:
   2.1. Python 3.13 is in early dev and has some errors with anyio library, so python 3.12 is used
   2.2. New user creating so the container does not run under root privileges

3. Docker-compose modified:
   3.1. env_file parameter added instead of directly expose tokens
   3.2. ollama-server modified to use ollama in a docker container - commented part is to use Nvidia GPU
   3.3. depends_on parameter removed to be able run containers separately (to run ollama locally instead of docker container)

4. Packages versions added to requirements.txt

5. Readme.md updated

[ruecat]

Thanks for the PR!