* language related deprecation fix
Reference: https://github.com/gohugoio/hugo/releases/tag/v0.158.0
.Site.LanguageCode -> .Site.Language.Locale
.Language.LanguageDirection -> .Language.Direction
.Language.LanguageCode -> .Language.Locale
Also, in the configuration hugo.toml, the user should change `languageCode` to `locale`.
* Update languageCode to locale in configuration
* fix(languages): update languageName to label in languages.toml
* .Language.LanguageName -> .Language.Label
* .Language.Lang -> .Language.Name
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Co-authored-by: Jimmy Cai <jimmy@cai.im>
* Markdown alerts
* refactor(alert): move alert color to variable.scss and simplify the style
* style: fix indent in render-blockquote
* feat(alert): add customizable alert icons for different alert types
* doc: add example usage of markdown alert
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Co-authored-by: Jimmy Cai <jimmy@cai.im>
