Longer initial glitch

Signed-off-by: Marcus Noble <github@marcusnoble.co.uk>

src/css/_glitch.scss

@@ -2,6 +2,10 @@
   animation-iteration-count: infinite
 }
 
+.glitch-image, .glitch {
+  animation-iteration-count: 5
+}
+
 .glitch-image {
   animation: shift 3s ease-in-out .2s alternate;
 }