fix: rebalance pong game to larger and small resolutions

[RodrigoDornelles]

• game.ball_size = ((game.width*game.height) ^ 0.5) / 80
• game.player_size = std.math.min(game.width, game.height) / 8
• game.ball_spd_x = game.width*0.0006
• game.ball_spd_y = game.height*0.0003
• game.player_pos = std.math.clamp(game.player_pos + (game.player_dir * game.ball_size), 0, game.height - game.player_size)
• std.draw.rect(0, game.ball_size, game.player_pos, game.ball_size, game.player_size)

related #56