Edit on GitHub button goes to broken link

On the main page, https://scpca.readthedocs.io/en/stable/, the Edit on github button links to https://github.com/Alexslemonade/scpca-docs/blob/main/index.md, which is broken.

Start with the main page at https://scpca.readthedocs.io/en/stable/ and inspect how its Edit on GitHub button is configured. Check the referenced https://github.com/Alexslemonade/scpca-docs/blob/main/index.md link and update the relevant documentation setting or target so the button resolves successfully.

Written by the indexing model from the issue text.