changed controls

after getting a lot of feedback about the controls I finally changed them to be more conventional

A moves left, D moves right, no center lane key

technically this should make the game harder but it looks like the intuitive controls make up for not being able to teleport across the center lane and my scores are higher than ever

also make a minor edit to the page html to match the new controls and added a destroy function to the powerup pickups so they will be removed if the player fails to pick them up

up next on the list is having the enemies teleport back if they get too close to the player

public trello with dev plan