How to reproduce this issue:

1. Visit this page https://www.pygmt.org/v0.6.1/install.html
2. Click the "Improve this page" button at the top right corner
3. The button links to "https://github.com/GenericMappingTools/pygmt/edit/main/doc/install", which doesn't exist

It worked in v0.4.0, but started to fail since v0.5.0.