docs: improve scss structure and admonition styling, update docs

Jacky Zhao

2022-07-31 234c707a93e1dbe438d0a45f1348cc6c39e2a265

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{{if $.Site.Data.config.enableGitHubEdit}}
<a href="{{$.Site.Data.config.GitHubLink}}/{{.Path}}" rel="noopener">Edit Source</a>
{{end}}