Migrate documents to the board-docs repo

[xijing21]

docs 仓库重新定位为工具功能使用介绍为主，开发板相关实操文档将在 board-docs 仓库维护。
基于上面的规划，将历史开发板文档进行迁移。

Summary by Sourcery

Documentation:

• Remove the K230D development board documentation from this repository as part of moving board-specific guides to board-docs.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR removes the K230D board documentation from the docs repository, aligning it with the new separation where this repository focuses on tool usage and board-specific hands-on documentation is maintained in board-docs.

File-Level Changes

Change	Details	Files
Remove the historical K230D board documentation from this repository as part of its migration to the dedicated board-docs repository.	Delete the K230D documentation category metadata. Delete the K230D introductory documentation page.	k230d/_category_.json k230d/intro.mdx

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[sourcery-ai]

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