V2.1

Some quick fixes after v2 release:

• Updated "How to play" menu to be more accurate.
• Made it so exit on webGL version does nothing.
• Ice pick should be working as intended now.
• Fixed an issue where the giant strength potion was not reducing attack speed.
• Changed attack speed values given by items.
• Fixed an issue where the boss was never getting reset.
• Fixed shop item text to fit more accurately.