docs: Typst Japan CommunityをTypst Japanese Communityに置換

[3w36zj6]

cf. https://github.com/typst-jp/typst-jp.github.io/pull/188#discussion_r2138903460

変更点

• Webサイト内の「Typst Japan Community」を「Typst Japanese Community」に置換した

備考

• マージ前にOrganizationの名称も変更する
• Identificationとしてのjpは変更しない

[Copilot]

Pull Request Overview

This pull request updates the community name from "Typst Japan Community" to "Typst Japanese Community" across the website and documentation. The change aims to better reflect the community's identity as discussed in the referenced GitHub discussion.

• Updates community name consistently across all user-facing text
• Maintains the organization identifier (jp) while changing the display name
• Affects both Japanese and English text content

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
website/src/components/ui/common/SiteNoticeBanner.tsx	Updates community name in both Japanese and English site notice banners
website/src/components/ui/common/Footer.tsx	Changes community name in the footer component
docs/overview.md	Updates community name in the documentation overview page
CONTRIBUTING.md	Updates community name reference in the contribution guidelines

[gomazarashi]

対応ありがとうございます。

[kimushun1101]

背景含めて承知いたしました。