[Documentation]: Readthedocs does not link to repository/GitHub making contributing/editing harder

[rugk]

STR

1. I was on https://ocrmypdf.readthedocs.io/en/latest/docker.html and wanted to contribute.
2. So I clicked "View page source" at the top, but surprisingly this only shows me a .txt file, not bring me to GitHub.
3. Further searching around the page at the bottom/end also did not reveal any source link for the page.

What did I expect

I was searching and expected to find a "Edit on GitHub" link or similar that takes me to GitHub exactly to that file, so I can contribute a little improvement/fix etc.

I don't know Readthedocs good enough to know whether this is possible, but IIRC other project had it.