fix(docs): remove ReActAgent references and update Maven dependency format

[chickenlj]

No description provided.

[Copilot]

Pull request overview

This PR updates the v2 landing-page intros to drop the ReActAgent hero tab/panel and changes the Maven “copy” UX to provide a full dependency XML snippet. It also adds a custom index.html via html_extra_path to redirect the docs site root (/) to the v2 intro page, honoring the user’s preferred language.

Changes:

• Remove the ReActAgent tab/code panel from docs/v2/*/intro.md hero sections.
• Update the Maven install copy button to copy a dependency XML snippet (with ${agentscope.version} placeholder).
• Add a root index.html redirect page under docs/_extra/ intended to send / to /v2/{lang}/intro.html.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
docs/v2/zh/intro.md	Removes ReActAgent hero tab/panel and updates Maven copy snippet to XML.
docs/v2/en/intro.md	Removes ReActAgent hero tab/panel and updates Maven copy snippet to XML.
docs/_extra/index.html	Adds root redirect page intended to send / to v2 intro, using preferred language.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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