swap convert and author icons so they line up with the correct category

pages/assets/css/_base.css

@@ -1157,11 +1157,11 @@ section.tools .cards > .card h3::before {
 }
 
 section.tools .cards > .card:nth-child(1) h3::before {
-  background-image: url("../img/convert.svg");
+  background-image: url("../img/author.svg");
 }
 
 section.tools .cards > .card:nth-child(2) h3::before {
-  background-image: url("../img/author.svg");
+  background-image: url("../img/convert.svg");
 }
 
 section.tools .cards > .card:nth-child(3) h3::before {