docs: improve scss structure and admonition styling, update docs

Jacky Zhao

2022-07-31 234c707a93e1dbe438d0a45f1348cc6c39e2a265

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{{if .Date}}
{{.Date.Format "Jan 2, 2006"}}
{{else if .Lastmod}}
{{.Lastmod.Format "Jan 2, 2006"}}
{{else}}
Unknown
{{end}}