Build 0.3.0

[h2]Happy Pi Day![/h2]

Below are the patch notes for Build 0.3.0.

- Added 'Extras' page for mini-games
- Added Car Chase and Pi Challenge in Extras menu
- Fix monkey not centered on a vine
- Adjusted random number target for Car Chase Challenge to 60-150, from 80-120
- Fix disappearing ground during the Car Chase Challenge
- Fix numbers hiding behind platforms during Car Chase Challenge
- UI Cleanups