Network refactor

[yallup]

Description

Removes the torch dependency and all network code (now exists elsewhere to be joined up in the future)
No additional fitting dependencies introduced.

Also a couple of small changes to the README from running the suggested pre-commit commands (calling black . starts churning through everything in a venv environment if built in directory)

Checklist:

• I have performed a self-review of my own code
• My code is black compliant (black . --check)
• My code is isort compliant (isort . --profile black --filter-files)
• My code contains compliant docstrings (pydocstyle --convention=numpy lsbi)
• New and existing unit tests pass locally with my changes (python -m pytest)
• I have added tests that prove my fix is effective or that my feature works
• I have appropriately incremented the semantic version number in both README.rst and lsbi/_version.py

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (65e7ec2) to head (1293df3).

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #40   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         5    -1     
  Lines          546       475   -71     
=========================================
- Hits           546       475   -71     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[yallup]

Think I accidentally pulled changes from the branch dimensionality a while ago, I can remake without those or that can be merged first?

[williamjameshandley]

I've removed the BMD changes -- please squash and merge @yallup