(docs): Migrate documentation to mkdocs

[serpro69]

Fix #262

• Update documentation and replace https://oss.sonatype.org/content/repositories/snapshots/ with https://central.sonatype.com/repository/maven-snapshots/
  • ref: https://central.sonatype.org/publish/publish-portal-snapshots/#consuming-snapshot-releases-for-your-project
• Update badges in readmes for both release and snapshots artifacts (needs Maven central snapshot repository badges/shields#10894)
• Link badges to browsable URLs:
  • release badge should link to respective module on central, e.g. for kotlin-faker artifact: https://central.sonatype.com/artifact/io.github.serpro69/kotlin-faker
  • snapshots badges should link to https://central.sonatype.com/service/rest/repository/browse/maven-snapshots/io/github/serpro69/kotlin-faker/

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• Orchid broke entirely after s01.oss.sonatype.org was shut down, so this requires migration to another doc engine now and will also fix Switch from Orchid to XXX #166 . I've had some nice experience with mkdocs in the past, as well as recently (e.g. one of my recent projects that uses mkdocs - https://github.com/serpro69/ktchn8s ) , so I think that's the way to go.
  • API docs. Done separately in Add API reference to docs #275
  • Documentation versioning

[Copilot]

Pull Request Overview

This PR migrates documentation from Orchid to MkDocs and adds comprehensive documentation for data providers. The migration was necessary after s01.oss.sonatype.org was shut down, breaking the existing Orchid-based documentation system.

Key changes:

• Complete migration to MkDocs with custom theming and styling
• Added comprehensive documentation pages for all data providers with examples
• Updated locale dictionary files to use MkDocs snippet format
• Added custom CSS for Nord theme and responsive design

Reviewed Changes

Copilot reviewed 287 out of 954 changed files in this pull request and generated 9 comments.

File	Description
docs/index.md	New homepage with interactive examples and feature descriptions
docs/pages/data-provider/	Complete documentation structure for all data providers with examples
docs/assets/stylesheets/	Custom CSS files for Nord theme and responsive design
core/src/main/resources/locales/en/*.yml	Updated snippet markers from Orchid format to MkDocs format

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