[Fix][Doc] Fix wrong link in about/index.html

[B1F030]

Purpose of this pull request

fix wrong href in about/index.html

您可以参阅[快速入门](/docs/category/start-v2/locally/deployment) 了解后续相关步骤。
fix ->
您可以参阅[快速入门](start-v2/locally/deployment.md) 了解后续相关步骤。

Does this PR introduce any user-facing change?

No

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.

[Hisoka-X]

LGTM. Thanks @B1F030 !