Release documentation

Release process

In case the jupyter labextions and/or the python code has been changed:

Run tests
```
make tests
```

Clean environment

make clean    # delete all temp files
make prepare  # commit deletions

Bump version of jupyter_cadquery

A new release candidate with rc0
```
make bump part=major|minor|patch
```
A new build
```
make bump part=build
```
A new release
```
make bump part=release
```

A new release without release candidate

make bump part=major|minor|patch version=major.minor.patch

Create distribution
```
make dist
```
Create and tag release
```
make release
```
Deploy to pypi
```
make upload
```
Create Docker container
```
make docker
```
Upload Docker container
```
make upload_docker
```

3 Push changes

Push repo and tag
```
git push
git push origin --tags
```