chore: improve cards compatibility with steps (#197)

layouts/shortcodes/card.html

@@ -79,3 +79,4 @@
     <div class="line-clamp-3 text-sm font-normal text-gray-500 dark:text-gray-400 px-4 mb-4 mt-2">{{- $subtitle | markdownify -}}</div>
   {{- end -}}
 </a>
+{{- /* Strip trailing newline. */ -}}

layouts/shortcodes/cards.html

@@ -1,5 +1,5 @@
 {{ $rows := .Get "rows" | default "3" }}
 
 <div class="hextra-cards mt-4 gap-4 grid not-prose" style="--rows: {{ $rows }};">
-  {{ .Inner }}
+  {{- .Inner -}}
 </div>