Release 2.3.0

[aaronspring]

• CL
• index.rst for rtd
• readme for github
• make CI pass

[github-actions]

Checkout your PR on . Open the console and pip install -e . before using the notebooks to use climpred from this PR.

[codecov]

Codecov Report

Merging #804 (9fedeac) into main (dafd1f3) will decrease coverage by 6.99%.
The diff coverage is 90.31%.

@@            Coverage Diff             @@
##             main     #804      +/-   ##
==========================================
- Coverage   93.80%   86.81%   -7.00%     
==========================================
  Files          59       58       -1     
  Lines        6235     6236       +1     
==========================================
- Hits         5849     5414     -435     
- Misses        386      822     +436     

Impacted Files	Coverage Δ
climpred/horizon.py	96.55% <ø> (ø)
climpred/options.py	81.48% <ø> (ø)
climpred/tests/test_graphics.py	100.00% <ø> (ø)
climpred/tests/test_hindcast_prediction.py	100.00% <ø> (ø)
climpred/tests/test_logging.py	100.00% <ø> (ø)
climpred/bootstrap.py	80.21% <72.61%> (-10.67%)	⬇️
climpred/alignment.py	91.13% <73.68%> (-5.74%)	⬇️
climpred/checks.py	94.11% <83.33%> (-1.65%)	⬇️
climpred/tests/test_HindcastEnsemble_class.py	96.51% <85.71%> (-3.49%)	⬇️
climpred/classes.py	91.94% <88.29%> (-1.56%)	⬇️
... and 42 more

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