fix: mindmap first item rendered indented

modules/wowchemy/layouts/_default/_markup/render-codeblock-markmap.html

@@ -1,6 +1,5 @@
 <div class="markmap" style="height: {{.Attributes.height | default "500px"}};">
-  <pre>
-    {{- .Inner | safeHTML -}}
-  </pre>
+{{/* No indentation before PRE and .Inner otherwise mindmap first item will be indented */}}
+<pre>{{- .Inner | safeHTML -}}</pre>
 </div>
 {{ .Page.Store.Set "has_markmap" true }}