refactor: simplify `<PrismicPreview>` logic

[angeloashmore]

Types of changes

• [x] 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 refactors <PrismicPreview> to simplify its logic. It removes checks that are not necessary and more strictly handles logic branches.

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.

[codecov-commenter]

Codecov Report

Merging #23 (06f85ff) into main (db8ca22) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #23   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          541       528   -13     
  Branches        22        24    +2     
=========================================
- Hits           541       528   -13     

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

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[github-actions[bot]]

size-limit report 📦

Path	Size
dist/index.js	2.37 KB (-1.07% 🔽)
./dist/index.cjs	7.11 KB (-0.4% 🔽)