Add spell checking and enforce docstrings

[blink1073]

No description provided.

[codecov]

Codecov Report

Base: 82.10% // Head: 82.10% // No change to project coverage 👍

Coverage data is based on head (68fc886) compared to base (7f079ee).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #484   +/-   ##
=======================================
  Coverage   82.10%   82.10%           
=======================================
  Files          20       20           
  Lines        2816     2816           
  Branches      516      516           
=======================================
  Hits         2312     2312           
  Misses        373      373           
  Partials      131      131           

Impacted Files	Coverage Δ
jupyter_releaser/__main__.py	0.00% <ø> (ø)
jupyter_releaser/actions/common.py	0.00% <ø> (ø)
jupyter_releaser/actions/finalize_release.py	0.00% <ø> (ø)
jupyter_releaser/actions/generate_changelog.py	0.00% <ø> (ø)
jupyter_releaser/actions/populate_release.py	0.00% <ø> (ø)
jupyter_releaser/actions/prep_release.py	0.00% <ø> (ø)
jupyter_releaser/changelog.py	72.72% <ø> (ø)
jupyter_releaser/cli.py	87.07% <ø> (ø)
jupyter_releaser/lib.py	80.62% <ø> (ø)
jupyter_releaser/mock_github.py	63.37% <ø> (ø)
... and 3 more

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