chore: Use new theme package and npm

[iamareebjamal]

Related fossasia/open-event-theme@a132b4d

[vercel]

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[codecov]

Codecov Report

Merging #4326 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #4326   +/-   ##
============================================
  Coverage        22.72%   22.72%           
============================================
  Files              468      468           
  Lines             4932     4932           
  Branches             5        5           
============================================
  Hits              1121     1121           
  Misses            3809     3809           
  Partials             2        2           

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