Revert "Update and rename 我们的作业.md to 开源与云计算课程体验.md"

This reverts commit b6f0364ab7d403228363950eb4d019eef946d638.
Revert "Revert "Update and rename 我们的作业.md to 开源与云计算课程体验.md""

This reverts commit 209a96b0b5ef64af502d15b27a14553810903b82.