Login fixes

This release includes more robust handling of logging in, user-based login instead of a single site-wide password, and various fixes and dependency upgrades.

DB URI file

This PR adds the ability to specify the DB connection URI via a file, instead of an environment variable.

Python, docker, and database updates

This release updates the python version to 3.8 (along with upgrading various dependencies), switches the default backend to PostgreSQL, and builds the docker image on Alpine Linux, to drastically reduce image size.

v0.3

Display the version number on each page.

v0.2

stuart is a python wiki system.
https://github.com/izrik/stuart

v0.2

Fixed a bug with setting the path prefix, which gunicorn didn't have access to.