Fix broken markdown links and add comprehensive API documentation

[pscheid92]

Summary

• Fix broken links across the repo: corrected the GitHub Flow URL in CONTRIBUTING.md, fixed relative paths to CONTRIBUTING.md from docs, and repaired the prerelease NuGet
  badge link in the readme
• Add comprehensive documentation pages covering all major Humanizer features: string transformations, date/time humanization, number conversions, enums, collections,
  ByteSize, configuration, custom vocabularies, and more
• Add an API reference stub as an entry point for the docs

Fixes #1659

[Copilot]

Pull request overview

This PR fixes broken documentation links (including the contributing guide path and NuGet badge target) and substantially expands the /docs site with feature-focused reference pages plus an API reference landing page, addressing #1659.

Changes:

• Fix broken markdown links (README NuGet prerelease badge; docs → contributing guide; CONTRIBUTING GitHub Flow URL).
• Add comprehensive feature documentation pages across strings, dates/times, numbers, enums, collections, ByteSize, configuration, and extensibility.
• Add an API reference stub page that links to the feature documentation.

Reviewed changes

Copilot reviewed 31 out of 31 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
readme.md	Fix prerelease NuGet badge link target.
.github/CONTRIBUTING.md	Fix GitHub Flow link URL.
docs/index.md	Fix contributing guide link and ensure docs index links to new pages.
docs/localization.md	Fix contributing guide link.
docs/api-reference.md	Add API reference landing/stub page linking to feature docs.
docs/bytesize.md	Add ByteSize feature documentation.
docs/collection-humanization.md	Add collection humanization documentation.
docs/configuration.md	Add Configurator/registry/strategy documentation.
docs/custom-vocabularies.md	Add documentation for extending pluralization vocabularies.
docs/datetime-humanization.md	Add DateTime/DateTimeOffset humanization documentation.
docs/datetime-ordinal-words.md	Add DateTime/DateOnly ordinal-words documentation.
docs/enum-dehumanization.md	Add enum dehumanization documentation.
docs/enum-humanization.md	Add enum humanization documentation.
docs/fluent-date.md	Add fluent date/time construction/manipulation documentation.
docs/heading.md	Add compass heading humanization documentation.
docs/inflector-methods.md	Add Pascalize/Camelize/Underscore/etc. documentation.
docs/metric-numerals.md	Add metric numeral conversion/parsing documentation.
docs/number-to-numbers.md	Add fluent numeric multiplier documentation.
docs/number-to-ordinal-words.md	Add ordinal-words conversion documentation.
docs/number-to-words.md	Add number-to-words documentation.
docs/ordinalization.md	Add ordinal suffix (1st/2nd/…) documentation.
docs/pluralization.md	Add pluralization documentation.
docs/roman-numerals.md	Add Roman numeral conversion/parsing documentation.
docs/singularization.md	Add singularization documentation.
docs/string-transformations.md	Add IStringTransformer / Transform documentation.
docs/time-unit-symbols.md	Add TimeUnit.ToSymbol() documentation.
docs/timeonly-clock-notation.md	Add TimeOnly.ToClockNotation() documentation.
docs/timespan-humanization.md	Add TimeSpan humanization documentation.
docs/to-quantity.md	Add ToQuantity documentation.
docs/tupleize.md	Add Tupleize documentation.
docs/words-to-number.md	Add words-to-number parsing documentation.

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[pscheid92]

Hello @clairernovotny, I applied the changes and also used Claude Code Opus 4.7 to check the documentation again (and applied an additional fix).