fix: 为了安全，使面板首页禁止搜索引擎收录

[hhun]

What this PR does / why we need it?

使面板首页禁止搜索引擎收录

Summary of your change

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

[f2c-ci-robot]

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[ruibaby]

https://github.com/1Panel-dev/1Panel/blob/dev/cmd/server/nginx_conf/index.html

这个我觉得也可以添加。

[zhengkunwang223]

/lgtm

[wanghe-fit2cloud]

/approve

[f2c-ci-robot]

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[hhun]

@wanghe-fit2cloud
请问卫衣来怎么领取？
您的Github个人主页不能私信，我邮箱 2966980@qq.com

[wanghe-fit2cloud]

@wanghe-fit2cloud 请问卫衣来怎么领取？ 您的Github个人主页不能私信，我邮箱 2966980@qq.com

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