remove deprecated grid functions

[FabianHofmann]

The function are deprecated since version v0.2.1

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I tested my contribution locally and it seems to work fine.
• I locally ran pytest inside the repository and no unexpected problems came up.
• I have adjusted the docstrings in the code appropriately.
• I have documented the effects of my code changes in the documentation doc/.
• I have added newly introduced dependencies to environment.yaml file.
• I have added a note to release notes doc/release_notes.rst.
• I have used pre-commit run --all to lint/format/check my contribution

[codecov]

Codecov Report

Base: 72.49% // Head: 72.73% // Increases project coverage by +0.23% 🎉

Coverage data is based on head (32af770) compared to base (a2627fe).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #275      +/-   ##
==========================================
+ Coverage   72.49%   72.73%   +0.23%     
==========================================
  Files          19       19              
  Lines        1596     1588       -8     
  Branches      225      225              
==========================================
- Hits         1157     1155       -2     
+ Misses        369      363       -6     
  Partials       70       70              

Impacted Files	Coverage Δ
atlite/cutout.py	74.86% <ø> (+2.04%)	⬆️

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