Clarify README Getting Started link

[version-1]

Clarify the README Getting Started link

Summary

Keep Getting Started as a regular README heading and direct readers to the appropriate published docs-site locale in the following paragraph.

主な変更点:

• Restore a plain Getting Started heading in the English README.
• Restore a plain Getting Started heading in the Japanese README.
• Add localized docs-site guidance immediately below each heading.

チケットへのリンク

ここはまだない

やったこと

• Replaced heading links with a short explanatory paragraph in both README files.
• Kept English and Japanese docs-site URLs locale-specific.

動作確認

• git diff --check
• Confirmed each heading is followed by the expected localized docs-site link.

レビュー & 動作確認 チェックリスト

• Heading - Confirm Getting Started renders as a regular heading.
• English link - Confirm the English README points to /tasq/.
• Japanese link - Confirm the Japanese README points to /tasq/ja/.

推奨テスト計画:

1. Open each README on GitHub.
2. Confirm Getting Started is not a link itself.
3. Follow the paragraph link and confirm the corresponding docs locale opens.

その他気になることや相談ごと

特になし

Requested by: @version-1