Use standard pre-commit config

[dstansby]

This applies the standard pre-commit-config.yaml file from https://github.com/SainsburyWellcomeCentre/python-cookiecutter, and fixes files as needed for this new config.

[codecov]

Codecov Report

Base: 85.26% // Head: 85.26% // No change to project coverage 👍

Coverage data is based on head (252a5ae) compared to base (dee8f21).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #138   +/-   ##
=======================================
  Coverage   85.26%   85.26%           
=======================================
  Files          11       11           
  Lines         536      536           
=======================================
  Hits          457      457           
  Misses         79       79           

Impacted Files	Coverage Δ
bg_atlasapi/cli.py	76.00% <ø> (ø)
bg_atlasapi/config.py	90.00% <ø> (ø)
bg_atlasapi/descriptors.py	100.00% <ø> (ø)
bg_atlasapi/list_atlases.py	97.95% <ø> (ø)
bg_atlasapi/structure_tree_util.py	100.00% <ø> (ø)
bg_atlasapi/update_atlases.py	88.00% <ø> (ø)
bg_atlasapi/utils.py	58.82% <ø> (ø)
bg_atlasapi/bg_atlas.py	84.04% <100.00%> (ø)
bg_atlasapi/core.py	90.00% <100.00%> (ø)

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