Implement new template system added with Hugo v0.146.0 (#1858)

* feat(layouts): move all files in layouts/_default up to the layouts/ root.

* feat(layouts): rename layouts/partials folder to layouts/_partials

* feat(layouts): rename layouts/shortcodes folder to layouts/_shortcodes

* feat(taxonomy): add new taxonomy layout template

A template named taxonomy.html used to be a candidate for both Page kind term and taxonomy, now it’s only considered for taxonomy.

layouts/_partials/post_meta.html

@@ -0,0 +1,23 @@
+{{- $scratch := newScratch }}
+
+{{- if not .Date.IsZero -}}
+{{- $scratch.Add "meta" (slice (printf "<span title='%s'>%s</span>" (.Date) (.Date | time.Format (default ":date_long" site.Params.DateFormat)))) }}
+{{- end }}
+
+{{- if (.Param "ShowReadingTime") -}}
+{{- $scratch.Add "meta" (slice (printf "<span>%s</span>" (i18n "read_time" .ReadingTime | default (printf "%d min" .ReadingTime)))) }}
+{{- end }}
+
+{{- if (.Param "ShowWordCount") -}}
+{{- $scratch.Add "meta" (slice (printf "<span>%s</span>" (i18n "words" .WordCount | default (printf "%d words" .WordCount)))) }}
+{{- end }}
+
+{{- if not (.Param "hideAuthor") -}}
+{{- with (partial "author.html" .) }}
+{{- $scratch.Add "meta" (slice (printf "<span>%s</span>" .)) }}
+{{- end }}
+{{- end }}
+
+{{- with ($scratch.Get "meta") }}
+{{- delimit . "&nbsp;·&nbsp;" | safeHTML -}}
+{{- end -}}