Minor post-jam update

Way too late post about a small post-jam update from about 8 months ago.

• Added GOOD ENDING art for the good endings.
• Updated the README in the zip files to properly credit the Latin Modern font used for the full page text. (The standalone README was already updated.)
• Updated the "About" screen to contain some of the same information as the README.
• Added a notification pop-up when the player gets a special ending.