Add alt-text to testpage images

styleguide/testpage.html

@@ -91,7 +91,9 @@ int *positives(int *numbers, int *size) {
         </p>
         <figure>
             <img src="assets/image/example_cat.jpg"
-                 alt="TODO"/>
+                 alt="Photograph of a young white-furred cat with blue eyes. It is leaning on its forelegs on some kind
+                      of leopard-print fabric and looking at something behind the camera. The background is dark and
+                      plain."/>
             <figcaption>Example image without any distortion applied.</figcaption>
         </figure>
         <p>
@@ -102,7 +104,10 @@ int *positives(int *numbers, int *size) {
         </p>
         <figure>
             <img class="glitch" src="assets/image/example_cat.jpg"
-                 alt="TODO"/>
+                 alt="The same photograph as before, except with a glitchy filer applied. The first effect applies to
+                      bright edges, which get surrounded by pink and blue to their left and right hand side. The second
+                      one distorts the image by offsetting parts of the image horizontally by seemingly random yet
+                      somewhat osscilating amounts."/>
             <figcaption>Example image with visual glitches applied.</figcaption>
         </figure>
     </section>