refactor: refactor theme and logo switching functionality

[LIlGG]

What this PR does / why we need it?

重构了主题切换，使其可以支持更多主题。

Summary of your change

1. 重构主题切换功能，将通过 ts 代码引入的基准色改为使用 css 文件引入。
2. 将 logo 改为 svg，可以通过主题来自动切换颜色。当专业版用户自定义 logo 之后，此功能失效。
3. 升级专业版的边框改为暗金配色。
4. 升级专业版时，将自动变为暗金主题，直到用户手动切换为其他主题。
5. 重构了获取 xpack 设置代码。

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.

None

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