chore(docs): load self hosted mermaid.js

[dreamorosi]

Please provide the issue number

Issue number: closes #634

Summary

This PR updates the mkdocs.yml file for the documentation so that it loads the mermaid.js script from our own CDN.

Changes

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User experience

Please share what the user experience looks like before and after this change

Checklist

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• Meets tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.45%. Comparing base (871f18b) to head (8088937).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #635      +/-   ##
===========================================
- Coverage    72.73%   72.45%   -0.28%     
===========================================
  Files          190      190              
  Lines         7886     7886              
  Branches       850      850              
===========================================
- Hits          5736     5714      -22     
- Misses        1860     1878      +18     
- Partials       290      294       +4     

Flag	Coverage Δ
unittests	72.45% <ø> (-0.28%)	⬇️

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