Updated readme to refer blui react theme for advance confiuguration

[shubham-eaton]

Fixes # .

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.67%. Comparing base (89cb444) to head (745312e).
Report is 7 commits behind head on release/mui-v6.

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/mui-v6     #676      +/-   ##
==================================================
+ Coverage           72.58%   72.67%   +0.08%     
==================================================
  Files                  89       89              
  Lines                1127     1127              
  Branches              246      244       -2     
==================================================
+ Hits                  818      819       +1     
  Misses                131      131              
+ Partials              178      177       -1     

Flag	Coverage Δ
unittests	72.67% <ø> (+0.08%)	⬆️

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Visit the preview URL for this PR (updated for commit 9c0e74d):

https://blui-react-login--pr676-feature-6193-update-66ruiryx.web.app

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[KomalGDhere-eaton]

changes are fine. please check prettier lint checks are failing.