docs: add Material for MkDocs documentation site (English + Japanese)

Add a documentation website under website/, built from README.md and
README-Japanese.md and laid out with top-tab topics and a left sidebar (same
style as the Hayabusa docs). Designed to be hosted free on GitHub Pages.

- Pages: Overview (About, Features, Screenshots), Getting Started, Commands
  (Command List, Command Usage), Resources (Companion Projects, Other
  Resources, Changelog, Contributing)
- Custom landing page, theme, click-to-zoom screenshots
- Changelog synced from CHANGELOG.md at build time
- 15-language switcher via mkdocs-static-i18n: English + Japanese full content;
  the other 13 localize the UI and fall back to English until translated
- .github/workflows/docs.yml builds (mkdocs --strict) + deploys to GitHub Pages

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

website/docs/resources/contributing.md

@@ -0,0 +1,30 @@
+# Contributing & Support
+
+## Contributions
+
+We would love any form of contribution.
+Pull requests are the best, but feature requests notifying us of bugs, etc... through issues are also very welcome.
+
+At the least, **if you like our tools and resources, then please give us a star on GitHub and show your support!**
+
+## Bug Submission
+
+* Please submit any bugs you find [here.](https://github.com/Yamato-Security/wela/issues/new?assignees=&labels=bug&template=bug_report.md&title=%5Bbug%5D)
+* This project is currently actively maintained, and we are happy to fix any bugs reported.
+
+## License
+
+* WELA is released under the [MIT License](https://opensource.org/licenses/MIT).
+
+## Contributors
+
+* Fukusuke Takahashi (core developer)
+* Zach Mathis (project leader, tool design, testing, etc...) (@yamatosecurity)
+
+## Acknowledgements
+
+* [Australian Cyber Security Centre: Windows event logging and forwarding](https://www.cyber.gov.au/resources-business-and-government/maintaining-devices-and-systems/system-hardening-and-administration/system-monitoring/windows-event-logging-and-forwarding)
+* [Microsoft: Advanced security auditing FAQ](https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/security/threat-protection/auditing/advanced-security-auditing-faq)
+* [SigmaHQ](https://github.com/SigmaHQ/sigma)
+
+## Twitter