Remove python2 support from pymarkups
pymarkups is developed by retext developers and in Solus is only used by retext.
- Add homepage.
- Add python-markdown-math as builddep and rundep.
- Enable check.
Signed-off-by: Algent Albrahimi <firstname.lastname@example.org>
Test Plan: Run retext and view some MD files.
Reviewers: Triage Team, DataDrake
Reviewed By: Triage Team, DataDrake
Differential Revision: https://dev.getsol.us/D8846