Examples: Remove timeliner demo. #20363
                
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Since
timeliner_guiis still not available as a module, I'd like to suggest to removemisc_animation_authoring.I also think it would have been better in the first place to not use the library of a fork but the original repository for an example (similar to Cannon.js/Cannon.ts).
In any event, since
misc_animation_authoringnever really demonstrated a library feature, a potential new timerliner showcase should reside outside of the official repo.