Update design for Status Page

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👋 Given the incident today, it seems folks have remembered that we have a status page (though it is very rarely used luckily). It'd be good to get the design updated on it to match the theme used on the site where possible.

Status page gives us very limited control, allowing for custom SCSS to be defined that'll apply globally to all pages and the ability to inject custom HTML (and JavaScript) in the footer of all pages.

The current customisations are documented in https://github.com/nodejs/build/pull/2299. Either we get that PR updated to capture new changes, or perhaps documenting those would be better in this repository now.

首先阅读 nodejs/build pull request 2299 中记录的自定义内容，并检查当前状态页面主题及其 SCSS、HTML 和 JavaScript 约束。确定这项工作应归入该 pull request 还是此仓库。完成的标准是：状态页面的设计在可能的情况下与网站主题一致，并且记录由此产生的自定义内容。