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/commands/index.ja.md

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+# コマンド一覧
+- `audit-settings`: Windowsイベントログ監査ポリシー設定を評価する
+- `audit-filesize`: Windowsイベントログファイルサイズを評価する
+- `configure`: 推奨のWindowsイベントログ監査ポリシーとファイズサイズを設定する
+- `update-rules`: WELAのSigmaルール設定ファイルを更新する

website/docs/commands/index.md

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+# Command List
+- `audit-settings`: Check Windows event log audit policy settings.
+- `audit-filesize`: Check Windows event log file size.
+- `configure`: Configure recommended Windows event log audit policy and file size.
+- `update-rules`: Update WELA's Sigma rules config files.

website/docs/commands/usage.ja.md

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+# コマンド使用例
+## audit-settings
+`audit-settings`コマンドは、Windowsイベントログ監査ポリシー設定を評価し、[Yamato Security](https://github.com/Yamato-Security/EnableWindowsLogSettings)、[Microsoft(Sever/Client)](https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/plan/security-best-practices/audit-policy-recommendations)、[Australian Signals Directorate (ASD)](https://www.cyber.gov.au/resources-business-and-government/maintaining-devices-and-systems/system-hardening-and-administration/system-monitoring/windows-event-logging-and-forwarding)の推奨設定と比較します。
+RuleCountは、そのカテゴリ内のイベントを検出できる[Sigmaルール](https://github.com/SigmaHQ/sigma)の数を示します。
+
+#### `audit-settings` command examples
+YamatoSecurityの推奨設定でチェックし、CSV形式で保存する:
+```
+./WELA.ps1 audit-settings -Baseline YamatoSecurity
+```
+
+Australian Signals Directorateの推奨設定でチェックし、CSV形式で保存する:
+```
+./WELA.ps1 audit-settings -Baseline ASD
+```
+
+Microsoftの推奨設定(Server)でチェックし、GUI形式で表示する:
+```
+./WELA.ps1 audit-settings -Baseline Microsoft_Server -OutType gui
+```
+
+Microsoftの推奨設定(Client)でチェックし、Table形式で表示する:
+```
+./WELA.ps1 audit-settings -Baseline Microsoft_Client -OutType table
+```
+
+## audit-filesize
+`audit-filesize`コマンドは、Windowsイベントログファイルサイズを評価し、Yamato Securityの推奨設定と比較します。
+
+#### `audit-filesize` command examples
+WindowsイベントログファイルサイズをYamatoSecurityの推奨設定でチェックし、CSV形式で保存する:
+```
+./WELA.ps1 audit-filesize -Baseline YamatoSecurity
+```
+
+## configure 
+`configure`コマンドは、推奨のWindowsイベントログ監査ポリシーとファイルサイズを設定します。
+
+#### `configure` command examples
+Yamato Securityの推奨設定を適用する（設定変更時に確認プロンプトを表示）:
+```
+./WELA.ps1 configure -Baseline YamatoSecurity
+```
+
+Australian Signals Directorateの推奨設定を自動で適用する:
+```
+./WELA.ps1 configure -Baseline ASD -auto
+```
+
+## update-rules
+#### `update-rules` command examples
+WELAのSigmaルール設定ファイルを更新する:
+```
+./WELA.ps1 update-rules
+```

website/docs/commands/usage.md

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+# Command Usage
+## audit-settings
+The `audit-settings` command checks the Windows event log audit policy settings and compares them with the recommended settings from [Yamato Security](https://github.com/Yamato-Security/EnableWindowsLogSettings), [Microsoft(Sever/Client)](https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/plan/security-best-practices/audit-policy-recommendations), and [Australian Signals Directorate (ASD)](https://www.cyber.gov.au/resources-business-and-government/maintaining-devices-and-systems/system-hardening-and-administration/system-monitoring/windows-event-logging-and-forwarding).
+`RuleCount` indicates the number of [Sigma rules](https://github.com/SigmaHQ/sigma) that can detect events within that category.
+
+### `audit-settings` command examples
+Check with the default Yamato Security's recommended settings and save results to CSV:  
+```
+./WELA.ps1 audit-settings -Baseline YamatoSecurity
+```
+
+Check with the Australian Signals Directorate's recommended settings and save results to CSV:  
+```
+./WELA.ps1 audit-settings -Baseline ASD
+```
+
+Check with Microsoft's recommended Server OS settings and display results in a GUI:  
+```
+./WELA.ps1 audit-settings -Baseline Microsoft_Server -OutType gui
+```
+
+Check with Microsoft's recommended Client OS settings and display results in table format:  
+```
+./WELA.ps1 audit-settings -Baseline Microsoft_Client -OutType table
+```
+
+## audit-filesize
+The `audit-filesize` command checks the Windows event logs' file size and compares them with the recommended settings from Yamato Security's recommendations.
+
+### `audit-filesize` command examples
+Check the Windows event log file size with Yamato Security's recommendations and save results to CSV:  
+```
+./WELA.ps1 audit-filesize -Baseline YamatoSecurity
+```
+
+## configure
+The `configure` command sets the recommended Windows event log audit policy and file size.
+
+#### `configure` command examples
+Apply Yamato Security's recommended settings (with confirmation prompt before changing settings):
+```
+./WELA.ps1 configure -Baseline YamatoSecurity
+```
+
+Apply Australian Signals Directorate's recommended settings without confirmation prompt:
+```
+./WELA.ps1 configure -Baseline ASD -auto
+```
+
+## update-rules
+#### `update-rules` command examples
+Update WELA's Sigma rules config files:  
+```
+./WELA.ps1 update-rules
+```