Avoid using xxxlarge naming convention on our tokens

[Febakke]

We use xxxlarge syntax on some of our tokens. We should use standard way of doing this that has better readablity. Example: xlarge- 2xlarge - 3xlarge - 4xlarge

• Typography heading

• Border-radius

### Tasks
- [ ] Decide on new naming
- [ ] Change token xxsmall for heading to 2xsmall
- [ ] Announce breaking change