Add files to test linked images in an SVG file

Author: tovrstra

files/images/linked.svg

@@ -106,13 +106,19 @@ files! {
     "images/f2t.jpg",
     "images/glacier.jpg",
     "images/graph.png",
+    "images/linked.svg",
     "images/logo.svg",
     "images/matplotlib.pdf",
     "images/molecular.jpg",
     "images/monkey.svg",
     "images/pattern.svg",
     "images/relative.svg",
     "images/rhino.png",
+    "images/small.gif",
+    "images/small.jpeg",
+    "images/small.jpg",
+    "images/small.png",
+    "images/small.webp",
     "images/tetrahedron.svg",
     "images/tiger.jpg",
     "images/typing.jpg",