feat: add modern content and navigation primitives

layouts/shortcodes/stats.html

@@ -0,0 +1,4 @@
+{{ $columns := .Get "columns" | default "3" }}
+<div class="not-prose my-10 grid gap-4 sm:grid-cols-2 {{ if eq $columns "4" }}lg:grid-cols-4{{ else }}lg:grid-cols-3{{ end }}">
+  {{ .Inner }}
+</div>