Refactors hazen repo for PyPI installation

[tomaroberts]

hazen is going to be split into two repos: one containing the source code, one for the webapp. This PR strips out the webapp code and retains the hazenlib code and tests.

Related Issue: #202.

Main changes:

• removed webapp-related files and folders – might still be some remaining
• overhauled setup.py
  • TestPyPI upload here: https://test.pypi.org/project/hazen/
  • nb: if you want to upload a new release to TestPyPI, you need to manually change the version number in setup.py, e.g.: 'version': '0.6.8' or whatever. For the actual PyPI release, this will be automatically extracted from the hazenlib version.
• removed tests/test_models.py as this was related to the webapp
• updated the requirements.txt with package version ranges and stripped out the webapp related packages

To test locally: No need to git clone, just:

# setup fresh venv & install
python3 -m venv hazen-pypi-test
source hazen-pypi-test/bin/activate
pip install hazen --extra-index-url=https://test.pypi.org/simple/

# test
hazen -h

Things to do/consider:

• [ ] strip out any remaining unnecessary files
• [ ] setup hazen-web-app repo and call hazenlib using pip
• [ ] setup Github actions

[tomaroberts]

Btw, DO NOT MERGE yet.

Creating PR for discussion and eventual merge once hazen-web-app is further along.

[tomaroberts]

@laurencejackson – is this PR unnecessary now given we have a PyPI release?

[laurencejackson]

@laurencejackson – is this PR unnecessary now given we have a PyPI release?

Probably can just remove it but might be useful if you take a look and see if there's anything you did in this PR which is missing in main?