Add footnotes back to supported platforms

[gdams]

Description of change

fixes: #1189
fixes: #1089

Adds footnotes back and also removes some unsupported platforms.

Checklist

• npm test passes
• documentation is changed or added (if applicable)
• permission has been obtained to add new logo (if applicable)
• contribution guidelines followed here

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[codecov]

Codecov Report

Attention: Patch coverage is 3.22581% with 30 lines in your changes missing coverage. Please review.

Project coverage is 81.46%. Comparing base (7337357) to head (13b064d).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/components/Support/PlatformMatrix/index.tsx	3.22%	30 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1191      +/-   ##
==========================================
- Coverage   81.52%   81.46%   -0.07%     
==========================================
  Files         157      156       -1     
  Lines       12014    12023       +9     
  Branches      923      933      +10     
==========================================
- Hits         9795     9794       -1     
- Misses       2219     2229      +10     

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