docs(themes): fix link in themes README.md

[jeremyfrank]

Fixes a broken link in the readme

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1 out of 2 committers have signed the DCO.
✅ (Gururajj77)[https://github.com/Gururajj77]
❌ @jeremyfrank
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.16%. Comparing base (9ec6285) to head (0b078a0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18406   +/-   ##
=======================================
  Coverage   84.16%   84.16%           
=======================================
  Files         408      408           
  Lines       14449    14449           
  Branches     4696     4700    +4     
=======================================
  Hits        12161    12161           
+ Misses       2124     2123    -1     
- Partials      164      165    +1     

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[annawen1]

LGTM! Thanks for catching that @jeremyfrank! All that's needed is for you to comment in this PR with

I have read the DCO document and I hereby sign the DCO.

[kennylam]

@jeremyfrank Thanks for this! Looks like you just need to sign the DCO (instructions in this comment).