Update JSON theme

[phixMe]

Problem

This makes the JSON theme more in line with our brand.

Checklist

• You've signed-off your work
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• You've included a one-line summary of your change for the CHANGELOG.md (Depending on the change, this may not be necessary).
• You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• You've included a header in any source code files (if relevant)

[netlify]

✅ Deploy Preview for peppy-sprite-186812 canceled.

Name	Link
🔨 Latest commit	67e3922
🔍 Latest deploy log	https://app.netlify.com/sites/peppy-sprite-186812/deploys/6632c2c34c69a70008faf18e

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.47%. Comparing base (6576fb3) to head (67e3922).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2807   +/-   ##
=========================================
  Coverage     84.47%   84.47%           
  Complexity     1429     1429           
=========================================
  Files           251      251           
  Lines          6460     6460           
  Branches        299      299           
=========================================
  Hits           5457     5457           
  Misses          850      850           
  Partials        153      153           

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[wslulciuc]

LGTM 💯 🚀