Revert "Added border case and doc"

[AlxEnashi]

Reverts #47

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 85.45%. Comparing base (e7002cc) to head (d13644d).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
alerce/search.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #48   +/-   ##
=======================================
  Coverage   85.45%   85.45%           
=======================================
  Files           7        7           
  Lines         392      392           
=======================================
  Hits          335      335           
  Misses         57       57           

Files with missing lines	Coverage Δ
alerce/search.py	85.29% <0.00%> (ø)

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