Move the RST files up a level and delete docs/spherical_geometry.
Move the contents from README.rst into a proper content in index.rst in the docs. And then just link to ReadTheDocs in the README. Then you can delete the duplicate inside.png in the root dir (needed it for #69 and added in #243).
Use a more modern theme, preferably with dark mode. FWIW astropy now uses pydata-sphinx-theme.
docs/spherical_geometry.README.rstinto a proper content inindex.rstin the docs. And then just link to ReadTheDocs in the README. Then you can delete the duplicateinside.pngin the root dir (needed it for #69 and added in #243).astropynow usespydata-sphinx-theme.