chore: update workflow for gh-pages

[thonatos]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

add vercel.json to gh-pages branch to disable auto-deployment.

[codecov]

Codecov Report

Base: 99.85% // Head: 99.85% // No change to project coverage 👍

Coverage data is based on head (26bd207) compared to base (344139e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5098   +/-   ##
=======================================
  Coverage   99.85%   99.85%           
=======================================
  Files          35       35           
  Lines        3483     3483           
  Branches      510      510           
=======================================
  Hits         3478     3478           
  Misses          5        5           

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