ALL types of pi creature are found! Importance to add them to 3b1b/manim

[CaftBotti]

Now all pi creatures are found by @CaftBotti ,
https://github.com/CaftBotti/manim_pi_creatures
Found in https://www.3blue1brown.com/images/pi-creatures/hooray.svg and so on.
And you can see pi_creature.py in @CaftBotti 's repository, it editted class PiCreature so you can use the svgs directly.
We think it's important to show them to the public, so we can all enjoy watching the cute pi creatures.