docs: next docs disallow robots

[latonz]

Disallow robots on the next docs preview page.

[codecov]

Codecov Report

Merging #563 (72f0d3f) into main (85347e4) will decrease coverage by 0.60%.
The diff coverage is 90.07%.

❗ Current head 72f0d3f differs from pull request most recent head e4e8e03. Consider uploading reports for the commit e4e8e03 to get more accurate results

@@            Coverage Diff             @@
##             main     #563      +/-   ##
==========================================
- Coverage   91.96%   91.37%   -0.60%     
==========================================
  Files         147      162      +15     
  Lines        4656     5517     +861     
  Branches      588      702     +114     
==========================================
+ Hits         4282     5041     +759     
- Misses        254      326      +72     
- Partials      120      150      +30     

Impacted Files	Coverage Δ
src/Riok.Mapperly/Helpers/HashHelper.cs	0.00% <0.00%> (ø)
.../Riok.Mapperly/Helpers/NullableSymbolExtensions.cs	92.98% <0.00%> (-2.02%)	⬇️
...numerables/EnsureCapacity/EnsureCapacityBuilder.cs	45.94% <42.10%> (-32.32%)	⬇️
src/Riok.Mapperly/MapperResults.cs	50.00% <50.00%> (ø)
src/Riok.Mapperly/ImmutableEquatableArray.cs	54.54% <54.54%> (ø)
...ok.Mapperly/Configuration/AttributeDataAccessor.cs	68.88% <64.58%> (-7.93%)	⬇️
.../Descriptors/MappingBuilders/SpanMappingBuilder.cs	80.00% <80.00%> (ø)
...lders/NewInstanceObjectMemberMappingBodyBuilder.cs	80.00% <83.33%> (+1.21%)	⬆️
...scriptors/InlineExpressionMappingBuilderContext.cs	95.91% <85.71%> (+0.79%)	⬆️
src/Riok.Mapperly/MapperNode.cs	87.50% <87.50%> (ø)
... and 56 more

... and 2 files with indirect coverage changes

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[github-actions]

🎉 This PR is included in version 2.9.0-next.3 🎉

The release is available on:

• GitHub release
• v2.9.0-next.3

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 3.0.0 🎉

The release is available on:

• GitHub release
• v3.0.0

Your semantic-release bot 📦🚀