docs(readme): replace the two static screenshots with an animated demo #851

Job	Run time
Docs	9s
Test	1m 7s
Build	57s
Typecheck (tests)	46s
Rust test (macOS compositor)	2m 49s
Rust check (Windows compositor)	1m 47s
Type Check	35s
Rust test (Linux compositor)	3m 15s
Lint	28s
Validate PR title (semantic)	0s
	11m 53s

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