center map sample data

[mathause]

• Closes offset lon by delta_lon / 2 in example data #70
• Tests added
• Passes isort . && black . && flake8
• Fully documented, including CHANGELOG.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (314b6bd) 94.80% compared to head (f997abe) 94.80%.

❗ Current head f997abe differs from pull request most recent head f43bd28. Consider uploading reports for the commit f43bd28 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #87   +/-   ##
=======================================
  Coverage   94.80%   94.80%           
=======================================
  Files           7        7           
  Lines         385      385           
=======================================
  Hits          365      365           
  Misses         20       20           

Flag	Coverage Δ
min-all-deps	94.79% <100.00%> (ø)
unittests	94.80% <100.00%> (ø)

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