Add topic guide for relevancy

[gruberb]

Adding a topic guide for Swift and Kotlin for the relevancy component. I also fixed a linking issue for the viaduct component.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.05%. Comparing base (da50019) to head (d197de0).

❗ There is a different number of reports uploaded between BASE (da50019) and HEAD (d197de0). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (da50019)	HEAD (d197de0)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6405       +/-   ##
===========================================
- Coverage   52.72%   27.05%   -25.67%     
===========================================
  Files         125      264      +139     
  Lines       12820    24981    +12161     
===========================================
  Hits         6759     6759               
- Misses       6061    18222    +12161     

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