website: replace Docusaurus template metadata and view-only edit URL

## What happened
The active new-official-website configuration in docusaurus.config.js still contains several template values:

- url: https://your-docusaurus-test-site.com
- organizationName: facebook
- projectName: docusaurus
- docs editUrl: https://github.com/apache/rocketmq-site/tree/new-official-website

The repository is Apache RocketMQ, and the tree URL opens a read-only view rather than GitHub's edit form.

## Why it matters
The placeholder metadata can produce incorrect canonical/social metadata, while the docs Edit this page action does not open an editor for RocketMQ contributors.

## Suggested fix
Set the actual production URL and RocketMQ repository metadata, and use the edit route for the intended docs branch. Please verify the generated metadata and one docs edit link.

Inspect docusaurus.config.js and compare the active new-official-website settings with the repository's production metadata and intended docs branch. Verify the generated metadata and one docs Edit this page link; the work is done when placeholders are gone and the link opens GitHub's edit form.

Written by the indexing model from the issue text.