Refactor Configuration System & Extend Documentation

.gitlab-ci.yml

conftest.py

docs/.gitignore

docs/source/_templates/autosummary/entire_class.rst

docs/source/_templates/autosummary/recursive_class.rst

docs/source/api/generation.rst

docs/source/api/index.rst

docs/source/conf.py

docs/source/index.md

docs/source/usage/examples/.gitignore

...es/guide_generator_scripts/custom_cmdline_args/kernels.py

...examples/guide_generator_scripts/inline_config/kernels.py

docs/source/usage/generator_scripts.md

docs/source/usage/index.md

docs/source/usage/project_integration.md

integration/CMakeDemo/CMakeLists.txt

integration/CMakeDemo/codegen_config.py

pyproject.toml

pytest.ini

src/pystencilssfg/__init__.py