📖 doc: add CDN design to repository

[spencerschrock]

What kind of change does this PR introduce?

doc update

• PR title follows the guidelines defined in our pull request documentation

What is the current behavior?

What is the new behavior (if this is a feature change)?**

• Tests for the changes have been added (for bug fixes/features)

Which issue(s) this PR fixes

NONE

Special notes for your reviewer

Does this PR introduce a user-facing change?

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application as a result of this pull request.)

NONE

[spencerschrock]

I'll cover specifics in a later PR once we're done implementing

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.67%. Comparing base (353ed60) to head (cfd6377).
⚠️ Report is 321 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4932      +/-   ##
==========================================
+ Coverage   66.80%   69.67%   +2.87%     
==========================================
  Files         230      251      +21     
  Lines       16602    15654     -948     
==========================================
- Hits        11091    10907     -184     
+ Misses       4808     3873     -935     
- Partials      703      874     +171     

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[github-actions]

This pull request has been marked stale because it has been open for 10 days with no activity