Use pixi for development and deployment

See merge request !17

[pyproject] Use pixi for development and deployment; Remove all traces of dev-profile dependant behaviour

fix(ruff): set to line length back to 88 as used originally

See merge request !16

That's the default for ruff but it makes it clearer that this
is what we want.

Adds support for pixi development installation

See merge request !15

Provide support for auto-generating pixi configuration files

See merge request !14

Add missing lines-between-types settings from isort

See merge request !13

Migrate qa to use ruff

See merge request !12

Use hatch

See merge request !11