Improve shortcode's use of markdownify

Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

Author: jviotti

layouts/shortcodes/best-practice.html

@@ -3,5 +3,10 @@ <h5 class="alert-heading">
     <i class="bi bi-award-fill me-1"></i> Best Practice
   </h5>
   <hr>
-  {{ .Inner | markdownify }}
+  {{ $inner := .Inner | markdownify }}
+  {{ if not (findRE "^<p>" $inner) }}
+    <p>{{ $inner }}</p>
+  {{ else }}
+    {{ $inner }}
+  {{ end }}
 </div>

layouts/shortcodes/common-pitfall.html

@@ -3,5 +3,10 @@ <h5 class="alert-heading">
     <i class="bi bi-exclamation-circle-fill me-1"></i> Common Pitfall
   </h5>
   <hr>
-  {{ .Inner | markdownify }}
+  {{ $inner := .Inner | markdownify }}
+  {{ if not (findRE "^<p>" $inner) }}
+    <p>{{ $inner }}</p>
+  {{ else }}
+    {{ $inner }}
+  {{ end }}
 </div>

layouts/shortcodes/learning-more.html

@@ -3,5 +3,10 @@ <h5 class="alert-heading">
     <i class="bi bi-book-half me-1"></i> Digging Deeper
   </h5>
   <hr>
-  {{ .Inner | markdownify }}
+  {{ $inner := .Inner | markdownify }}
+  {{ if not (findRE "^<p>" $inner) }}
+    <p>{{ $inner }}</p>
+  {{ else }}
+    {{ $inner }}
+  {{ end }}
 </div>