OB Wheel: Pregnancy calculator

Feb 21, 2024

- Fixed bug where selecting a month from the month grid does not match the correct year. (thisboxdate in gridcal_new)
- Fixed bug in gridcal code to ignore touchmove when gridcal is active.
- Cleaned up reference links in #aboutbili page.
- Fixed CSS bug in the Bili navigator that was causing issues for Safari/Opera browsers.