Background

A large number of repositories have renamed the default branch name from `master` to `main`

In the Ansible ecosystem we are trying to achieve standardization regarding to repository, issue, discussions, docs etc.

Other teams in the ansible org have already renamed and on the pulp organization every repo is renamed.

**

Supporting documentation

A guide for renaming https://gist.github.com/danieldogeanu/739f88ea5312aaa23180e162e3ae89ab 

Ressoning
https://www.theserverside.com/feature/Why-GitHub-renamed-its-master-branch-to-main#:~:text=GitHub%20took%20action%20based%20on,a%20different%20default%20for%20new 

Checklist

• Branch renamed
• readme and docs updated
• CI scripts updated
• CRC deployment updated
• Galaxy deployment updated
• Team notified to rename its local remotes

Repos affected

https://github.com/ansible/ansible-hub-ui/ 
https://github.com/ansible/galaxy_ng 
https://github.com/ansible/galaxy-importer
https://github.com/ansible/automation-hub-deploy