:beetle: Fix missing image in article

src/templates/main.html

@@ -75,8 +75,8 @@ $endfor$
 $if(title)$
             <header id="title-block-header" class="focus-center">
                 <h1 class="title">$title$</h1>
-$if(title-img)$
-                <img class="rounded" src="$title-img.path$"$if(title-img.alt)$ alt="$title-img.alt$"$endif$>
+$if(img.main)$
+                <img class="rounded" src="$img.main.path$"$if(img.main.alt)$ alt="$img.main.alt$"$endif$>
 $endif$
 $if(subtitle)$
                 <h2 class="subtitle">$subtitle$</h2>