Prepare release

[OriolAbril]

Description

Preparation for 0.17.0 release. I will update the version number in this
PR too later on.

So far it does:

• rerun quickstart and working with inferencedata notebooks
• doc fixes for homepage and type aliases
• add encoding arg for reading html_repr's css (closes UnicodeDecodeError when i import arivz #2274)
• improve psislw docstring (closes Renormalization step in psislw creating different behaviour to loo::psis in R #2148)
• add docstring to smooth_data (closes smooth_data interpolates observations and predictions differently #2225)
• remove show=True in tests

Checklist

• Follows official PR format
• Code style correct (follows pylint and black guidelines)
• Changes are listed in changelog

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📚 Documentation preview 📚: https://arviz--2300.org.readthedocs.build/en/2300/

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Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (27b8a49) 86.74% compared to head (2c4d10f) 86.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2300      +/-   ##
==========================================
- Coverage   86.74%   86.73%   -0.01%     
==========================================
  Files         122      122              
  Lines       12705    12705              
==========================================
- Hits        11021    11020       -1     
- Misses       1684     1685       +1     

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