Major pipeline refactor

See merge request !1

Merge branch 'refactor-pipeline' of fhm-chicas-code.lancs.ac.uk:jewell/covid-pipeline into refactor-pipeline

CHANGES:

1. Move to v0.8.0-alpha0 of `covid19uk` model
2. Add `config.yaml` basic config for Docker image
3. Add Dockerfile

This release is in alpha stage.  Features may be undocumented
and broken.  Refer to the LICENCE file for warranty (or lack thereof)
information.

Merge branch 'refactor-pipeline' of fhm-chicas-code.lancs.ac.uk:jewell/covid-pipeline into refactor-pipeline

Non-model-dependent scripts moved to pipeline repository.