Change grid layout to single column in main

Now all the articles would appear in alike rather than one been dominant and others sharing a line.

Author: TTiamiyu

Wireframe/style.css

@@ -72,10 +72,8 @@ https://gridbyexample.com/learn/
 */
 main {
   display: grid;
-  grid-template-columns: 1fr 1fr;
+  grid-template-columns: 1fr;
   gap: var(--space);
-  > *:first-child {
-    grid-column: span 2;
   }
 }
 /* ====== Article Layout ======