wq.build 2.0 alpha

wq.build 2.0.0a1 is the alpha of the upcoming 2.0 version of wq.build. The functionality is mostly the same as wq.build 1.3, with a few changes (all by @sheppard).

• Removed the deprecated wq versions command (437b86d)
• In default serviceWorker template, ignoreVary when loading index.html (3e3f666)
• Switch to pyproject.toml, update layout, and test latest Python version. (32068b3, 01cb337)