Broken links reported when serving MarkBind docs

[tlylt]

Is there an existing issue for this?

• I have searched the existing issues

Any related issues?

#1820 for email

Tell us about your environment

Windows 10

MarkBind version

3.1.1

What did you do? Describe the bug

Serve the MarkBind docs locally, and saw 3 broken links reported.

Steps to reproduce

checkout to the master branch of the markbind repo
cd docs
markbind serve

Expected behavior

No broken links

Actual behavior

Anything else?

No response