docs(toolkit-lib): add CODE_REGISTRY directly to doc site

[kaizencc]

Looks like this on the doc site:

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[kaizencc]

I have no reason besides I think this is the right place to put the code registry. imo it doesn't make sense to have it on the base level so under the Toolkitumbrella seems like the most logical place to put it.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.97%. Comparing base (035c527) to head (f8bf813).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
- Coverage   85.28%   84.97%   -0.31%     
==========================================
  Files         207      207              
  Lines       35706    35706              
  Branches     4633     4604      -29     
==========================================
- Hits        30451    30342     -109     
- Misses       5102     5213     +111     
+ Partials      153      151       -2     

Flag	Coverage Δ
suite.unit	84.97% <ø> (-0.31%)	⬇️

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