♻️ Refactor: move all files in layouts/_default up to the layouts/ root (#607)

The `_default` folder is removed.

layouts/taxonomy.html

@@ -0,0 +1,25 @@
+{{- define "title" -}}
+  {{- .Params.Title | default (T .Data.Plural) | default .Data.Plural | dict "Some" | T "allSome" -}}
+  {{- if .Site.Params.withSiteTitle }} {{ .Site.Params.titleDelimiter }} {{ .Site.Title }}{{- end -}}
+{{- end -}}
+
+{{- define "content" -}}
+  {{- $taxonomies := .Data.Plural -}}
+  {{- $iconMap := dict
+    "categories" "fa-solid fa-folder-tree"
+    "collections" "fa-solid fa-layer-group"
+    "tags" "fa-solid fa-tags"
+  -}}
+  {{- $icon := index $iconMap $taxonomies | default $iconMap.categories -}}
+
+  <div class="page archive">
+    {{- /* Title */ -}}
+    <h1 class="single-title animate__animated animate__pulse animate__faster">
+      {{- dict "Class" (add $icon " fa-fw me-1") | partial "plugin/icon.html" -}}
+      {{- .Params.Title | default (T $taxonomies) | default $taxonomies | dict "Some" | T "allSome" }} <sup>{{ len .Data.Terms.ByCount }}</sup>
+    </h1>
+    {{- /* Render different taxonomies */ -}}
+    {{- $template := cond ( eq $taxonomies "tags") "tags" "taxonomies" -}}
+    {{- .Render $template -}}
+  </div>
+{{- end -}}