refactor: simplify Prismic preview cookie reading

[angeloashmore]

Types of changes

• [ ] Chore (a non-breaking change which is related to package maintenance)
• [ ] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

This PR cleans up the repository in two ways:

1. Removes an unused AVA configuration file.
2. Refactors logic to read the Prismic preview cookie within a browser for greater simplicity.

Checklist:

• [ ] My change requires an update to the official documentation.
• [x] All TSDoc comments are up-to-date and new ones have been added where necessary.
• [x] All new and existing tests are passing.

🦆

[github-actions[bot]]

size-limit report 📦

Path	Size
dist/index.js	4.06 KB (-0.08% 🔽)
./dist/index.cjs	8.34 KB (-0.02% 🔽)

[codecov-commenter]

Codecov Report

Merging #34 (7a54b64) into main (1a654af) will increase coverage by 0.15%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main       #34      +/-   ##
===========================================
+ Coverage   99.84%   100.00%   +0.15%     
===========================================
  Files          11        11              
  Lines         664       665       +1     
  Branches       31        33       +2     
===========================================
+ Hits          663       665       +2     
+ Partials        1         0       -1     

Impacted Files	Coverage Δ
src/PrismicPreview.tsx	100.00% <100.00%> (ø)
src/lib/getPrismicPreviewCookie.ts	100.00% <100.00%> (ø)

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