Add v7 branch as production branch

[KaneFreeman]

Description

Code

This PR touches:

• [ ] Content
• [ ] Content Pipeline
• [ ] Frontend
• [x] Infrastructure

Tests

• [ ] Tests are included?

[dojo-site]

This pull request has been deployed to:

• next-dojo-io: https://next-dojo-io-5by4uqzrp.now.sh
• zh-cn-next-dojo-io: https://zh-cn-next-dojo-io-p7tgyozos.now.sh