Add binder and thebe integration

[angelphanth]

Closes #18

Copilot summary:
This pull request adds support for interactive executable code cells in the documentation using Thebe, and improves integration with interactive notebook platforms like Google Colab and Binder. The documentation is updated with setup instructions for these platforms, and configuration changes are made to enable and configure Thebe, Binder, and Colab launch buttons. The changes also update repository references and add relevant dependencies.

Interactive notebook support and configuration:

• Added detailed setup instructions for Colab, Binder, and Thebe in docs/README.md, including configuration examples for enabling launch buttons and interactive code cells in the documentation.
• Enabled Thebe by adding sphinx_thebe to the list of Sphinx extensions in docs/conf.py, and configured thebe_config to make all code cells runnable. [1] [2]
• Configured launch buttons in html_theme_options in docs/conf.py to support Colab, Binder, and Thebe, and set the notebook interface to JupyterLab.

Repository and dependency updates:

• Updated repository URLs in docs/conf.py to point to biosustain/python_package instead of RasmussenLab/python_package.
• Added sphinx-thebe to the documentation dependencies in pyproject.toml.

Interactive code cell enhancements:

• Added an HTML button to activate Thebe in the tutorial notebook (docs/tutorial/tutorial.ipynb) and script (docs/tutorial/tutorial.py). [1] [2]
• Updated notebook metadata to include Python language info.