Fixing SDEC labels bug in the documentation

[atharva-2001]

This aims to fix #1485

Description

As far as I know, plotly labels are not recognized as math objects and therefore MathJax is not loaded in the sphinx documentation. Adding an extra cell with latex in it forces MathJax to load and thus labels in plotly figure are rendered.
For reference please see:
spatialaudio/nbsphinx#369
plotly/plotly.py#1243
and this thread

Motivation and Context

resolves #1485

How Has This Been Tested?

• Testing pipeline
• Reference Data Comparison following these instructions
• Other (please describe)

The labels are parsed correctly in my documentation

Screenshots (if appropriate):

Before:

After:

Types of changes

• 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 not work as expected)
• None of the above (please describe)

Checklist:

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have built the documentation on my fork following these instructions
• I have assigned and requested two reviewers for this pull request

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Merging #1531 (f4bf41a) into master (b7eac7e) will not change coverage.
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@@           Coverage Diff           @@
##           master    #1531   +/-   ##
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  Coverage   67.57%   67.57%           
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  Files          68       68           
  Lines        6100     6100           
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  Hits         4122     4122           
  Misses       1978     1978           

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[marxwillia]

Great change.