feat: add last updated component

chore: option to reverse pagination

chore: reverse pagination for blog entries

- fix space for "by" authors

layouts/partials/components/last-updated.html

@@ -0,0 +1,8 @@
+{{ if site.Params.displayUpdatedDate }}
+  {{- with .Lastmod -}}
+    {{ $datetime := (time.Format "2006-01-02T15:04:05.000Z" .) }}
+    <div class="mt-12 mb-8 block text-xs text-gray-500 ltr:text-right rtl:text-left dark:text-gray-400">Last updated on <time datetime="{{ $datetime }}">{{ partial "utils/format-date" . }}</time></div>
+  {{- end -}}
+{{ else }}
+  <div class="mt-16"></div>
+{{ end }}