Cleanup: remove blender-cloud specific pug component.

src/templates/mixins/components.pug

@@ -84,20 +84,3 @@ mixin timeline(projectid, sortdirection)
 			//- TODO: Make nicer reuseable placeholder
 			.h3.text-muted.m-auto
 				i.pi-spin.spin
-
-
-//- Category listing (Learn, Libraries, etc).
-mixin category_list_item(title, text, url, image)
-	.row.pb-2.my-2
-		.col-md-3
-			a(href=url, title=title)
-				img.img-fluid(alt=title, src=image)
-		.col-md-9
-			a(href=url, title=title)
-				h3.font-weight-bold
-					=title
-			.lead
-				=text
-
-			if block
-				block