Remove stale assets, update architecture fig

[BradyPlanden]

• Removes stale assets
• Updates the architecture figure to use a .svg representation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.29%. Comparing base (8624a44) to head (93f33e6).
Report is 45 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #221      +/-   ##
===========================================
- Coverage    94.59%   94.29%   -0.30%     
===========================================
  Files           45       32      -13     
  Lines         1925     1614     -311     
===========================================
- Hits          1821     1522     -299     
+ Misses         104       92      -12     

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[NicolaCourtier]

Good catch, thanks for removing the outdated diagrams.