Rename repository to just neaps

[bkeepers]

After #174, this repo now contains multiple packages (neaps, and @neaps/tide-predictor).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e988386) to head (ac09aa3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #177   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          491       491           
  Branches        44        44           
=========================================
  Hits           491       491           

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