Cleanup python; scrape dates of pizza from sites and restructure pizza...

- Cleanup python; scrape dates of pizza from sites and restructure pizza dta to include it
- Stylize (still non-functional) mobile-only arrows intended for switching between days

TODO: 
- Use pizza date info to find if pizzas are current or not; if not, set desc to self.unknown_text
- Implement mobile-only day-switching arrows in javascript