Add smaller animation copies to README.md.

animations/(200x200, 600x600)/
	-Add subdirs for `gif`s of specific sizes.
	-Move existing `gif`s to `600x600/`, and add `200x200px` copies
	to `200x200/` for display in `README.md`.

README.md
	-Add links to the animations inside `animations/200x200/`.