Remove hyperspectral.analyze_index

[nfahlgren]

Describe your changes
In PlantCV4 pcv.hyperspectral.analyze_index is replaced with pcv.analyze.spectral_index

Type of update
Is this a: update

For the reviewer
See this page for instructions on how to review the pull request.

• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv/mkdocs.yml
• Changes to function input/output signatures added to updating.md
• Code reviewed
• PR approved

[codecov]

Codecov Report

Merging #1208 (4eca13f) into release-4.0 (13ab4e2) will not change coverage.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##           release-4.0     #1208   +/-   ##
=============================================
  Coverage       100.00%   100.00%           
=============================================
  Files              164       163    -1     
  Lines             7014      6968   -46     
=============================================
- Hits              7014      6968   -46     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
plantcv/plantcv/hyperspectral/__init__.py	100.00% <100.00%> (ø)