Release Apollo 0.0.6

[antoinevg]

This is the tracking issue for the next Apollo release.

### Tasks not yet associated with an Issue or Pull Request
- [x] Rename master branch to main

### Issues
- [ ] https://github.com/greatscottgadgets/apollo/issues/35
- [ ] https://github.com/greatscottgadgets/apollo/issues/43

### Review, merge or close outstanding pull requests
- [ ] https://github.com/greatscottgadgets/apollo/pull/23
- [ ] https://github.com/greatscottgadgets/apollo/pull/22
- [ ] https://github.com/greatscottgadgets/apollo/pull/37
- [ ] https://github.com/greatscottgadgets/apollo/pull/36
- [ ] https://github.com/greatscottgadgets/apollo/pull/47

[antoinevg]

Merged into #44