Adapt screen size + border for all devices and game parts

[myselfhimself]

• Redecide if fullscreen should be abandoned or not (especially for the graphics-power consuming game over screen)
• Use a div as p5js canvas parent: https://stackoverflow.com/a/64320776/420684
• Use same Canvas size as a YouTube player (1.777 ratio)... or p5js play library's breakout game canvas size
• Add nicely decorated HTML border
• Ensure display runs smoothly (speed and layout)
• Ensure mobile displays run the game OK (everything visible and big enough, especially canvas size vs. touchability with big fingers)

[myselfhimself]

Inspiration https://www.jeux-gratuits.com/jeu-brick-breaker-3d.html