Sunday Sabbath?

Why do we have a Sunday Sabbath?
If the Sabbath in the Old Testament is the seventh day, why do Catholics rest and worship on Sunday, the 1st (or "8th" day) of the week?
Are Christians in general and Catholics specifically breaking the Ten Commandments? If we can seemingly change the adherence to the Ten Commandments with a Sunday Sabbath, why not other ones of the ten commandments?
What does the resurrection and the new creation have to tell us about why the new Sabbath of the new covenant is now celebrated on Sunday?
In this video, Dr. Brant Pitre explains what Jesus' Resurrection and the New Creation have to do with this mysterious difficulty.
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Image Attribution:
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Henry Ossawa Tanner [Public domain]
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Nheyob [CC BY-SA 4.0 (creativecommon...)]
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Masolino da Panicale [Public domain]
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Jean I Restout [Public domain]
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David from Colorado Springs, United States [CC BY 2.0 (creativecommon...)]
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Barbara Carr / Sculpture showing infant baptism
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Nicolas Poussin [Public domain]