Sokoban: Add world4-006, world4-007, world4-008

PR: https://github.com/DoctorLai/sokoban-web/pull/34

world4-006

https://doctorlai.github.io/sokoban-web/?level=world4-006

world4-007

https://doctorlai.github.io/sokoban-web/?level=world4-007

world4-008

https://doctorlai.github.io/sokoban-web/?level=world4-008

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