docs/zh_CN: Add security index Chinese translation
Translate .../security/index.rst into Chinese.
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Yuehui Zhao <zhaoyuehui@cqsoftware.com.cn>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/89ad67b4b4e12a52581cfa0f87f194e1aee3e526.1734575890.git.zhaoyuehui@cqsoftware.com.cn
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