[docs] Rename the POC getting started guide

[dataroaring]

Summary

• rename the getting started POC guide to Before You Start the POC
• update the English and Chinese localized doc filenames to match the new slug
• update the sidebar entry to point to the renamed page

[Copilot]

Pull request overview

Renames the “getting started POC guide” doc to use the new “Before You Start the POC” slug/title and updates navigation so the sidebar points at the renamed page (including the zh-CN localized doc path).

Changes:

• Update the Getting Started sidebar entry to reference gettingStarted/before-you-start-the-poc.
• Rename/update the English doc front matter + H1 to “Before You Start the POC”.
• Add the zh-CN localized doc at the matching new filename/slug.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
sidebars.ts	Updates sidebar doc id to the new slug.
docs/gettingStarted/before-you-start-the-poc.md	Updates English page title/label/H1 for the renamed guide.
i18n/zh-CN/docusaurus-plugin-content-docs/current/gettingStarted/before-you-start-the-poc.md	Adds zh-CN page under the new slug to match the rename.

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[Copilot]

This doc rename changes the URL from /gettingStarted/must-read-before-poc to /gettingStarted/before-you-start-the-poc. Since the site already uses @docusaurus/plugin-client-redirects (see docusaurus.config.js), please add a redirect from the old path to the new one to avoid breaking existing inbound links/bookmarks.