Move documentation to markdown

Move documentation to markdown so it is visible in PyPI

Fix documentation, cleanup dependencies

Feature.add correct description (#8)

* Fi licensing

* Fix Description

* Bumped version

* Regenerate dev-requirements

* Regenerated requirements

* Add backports.zoneinfo;python_version<3.9  to support Python 3.8

Drop support for old Django(<3.2) and Python(<3.8) versions

Drop support for old Django(<3.2) and Python(<3.8) versions
Separate dev and not-dev dependencies.
Migrate to pyproject.toml.
Use compiled dependencies.
Fix linting and formatting.

Release version 0.2

Admin view is added for more convenient management of snapshots.

Release version 0.1

Beta version of Django Liquidb. Minimal functionality that allows user to:

• create snapshot
• checkout to snapshot by name
• checkout to latest created snapshot
• delete all snapshot history
• delete snapshot by name