Sokoban: Add World1-019 and World1-020

PR: https://github.com/DoctorLai/sokoban-web/pull/13

World1-019

https://doctorlai.github.io/sokoban-web/?level=world1-019

World1-020

https://doctorlai.github.io/sokoban-web/?level=world1-020

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