docs(site): adjustment site style

[HaixingOoO]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

💡 需求背景和解决方案

• adjustment site style

before:

after:

📝 更新日志

• docs(site): 调整网站样式

• 本条 PR 不需要纳入 Changelog

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[pkg-pr-new]

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npm i https://pkg.pr.new/Tencent/tdesign/@tdesign/site-components@764

npm i https://pkg.pr.new/Tencent/tdesign/tdesign-theme-generator@764

commit: 34cab6d

[tdesign-bot]

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tdesign-vue
tdesign-react
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@tdesign-vue-next/chat
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tdesign-miniprogram

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