Adds new SEO category

Related to #1499
Adds SEO category and moves Yoast (wordpress plugin) from marketing
automation to seo.

I can think of another - sh404sef for Joomla that will fit in the same
category, as well as all-in-one-seo for wp

src/apps.json

@@ -9641,7 +9641,7 @@
 		},
 		"Yoast SEO": {
 			"cats": [
-				"32"
+				"54"
 			],
 			"html": [
 				"<!-- This site is optimized with the Yoast"
@@ -10996,6 +10996,10 @@
 		"53": {
 			"name": "CRM",
 			"priority": "9"
-		}
+		},
+    "54": {
+      "name": "SEO",
+      "priority": "9"
+    }
 	}
 }