Migrate checklists

[cesarvarela]

closes #3021

deploy https://pr-3267--staging-aiid.netlify.app (might need to be whitelisted)

[codecov]

Codecov Report

Attention: Patch coverage is 70.93690% with 152 lines in your changes missing coverage. Please review.

Project coverage is 96.34%. Comparing base (97c647f) to head (49541b8).
Report is 13 commits behind head on staging.

Files with missing lines	Patch %	Lines
site/gatsby-site/server/fields/checklists.ts	26.92%	152 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #3267      +/-   ##
===========================================
- Coverage    97.35%   96.34%   -1.01%     
===========================================
  Files           59       62       +3     
  Lines        13163    13685     +522     
  Branches       300      216      -84     
===========================================
+ Hits         12815    13185     +370     
- Misses         334      500     +166     
+ Partials        14        0      -14     

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[cesarvarela]

Fixed the delete functionality and removed the obsolete field.

[kepae]

@lmcnulty please shepherd this into the next deploy when ready.