biology/gperiodic: Improve port, take maintainership
- Add education to CATEGORIES
- Improve COMMENT and pkg-descr
- Pet portclippy(1) and portfmt(1)
Approved by: db@, yuri@ (Mentors, implicit)
MFH: 2026Q3
(cherry picked from commit a7d6232b906f19f985752843b167a1585b9f3539)