UI: improve testimonials component

[gdams]

Description of change

Jazzed it up a little bit:

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

All modified and coverable lines are covered by tests ✅

Project coverage is 81.66%. Comparing base (daf3a80) to head (f0d0fc8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1190      +/-   ##
==========================================
+ Coverage   80.78%   81.66%   +0.87%     
==========================================
  Files         157      156       -1     
  Lines       11976    11992      +16     
  Branches      914      933      +19     
==========================================
+ Hits         9675     9793     +118     
+ Misses       2301     2199     -102     

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