Update to branch name to"main" for inclusive design language

### Describe the bug

It is important to build our technology with **inclusive design language** in order to foster an inclusive workplace where everyone feels they can belong. In order to achieve this, can we change our branch name from `master` to `main`?
### To Reproduce
Steps to reproduce the behavior:
1. Go to **branches** dropdown
2. See `master` branch

### Expected behavior

1. Change branch name from `master` to `main` and update in readme [here](https://github.com/anitab-org/documentation/blame/master/quality-assurance.md#L40) .
### Screenshots