Insegel is a theme for Sphinx, intended to unify my project documentation's theme with that of Hrǽw. The theme's documentation is available here.
To use the Insegel theme, install it via pip:
pip install insegel
Or, you can add it to your Sphinx project's requirements files. You can then set Sphinx to use the theme via:
html_theme = 'insegel'
within your documentation's conf.py file.