Chemics v23.11

Added

• A pyproject.toml file for package installation
• Source directory for src layout
• Conda environment.yml for developing in a conda environment
• A benchmarks file for methods in the Gas class
• GitHub workflow to run tests
• Doctest and plot support for Sphinx documentation

Changed

• Moved all examples into documentation
• Change pyroI and pyroII to pyrolysis_one and pyrolysis_two functions
• Refactor Gas and GasMixture classes

Removed

• Unused requirements file for pip