fix order of perlin noise videos

Author: shiffman

content/tracks/side-tracks/noise/index.json

@@ -2,8 +2,8 @@
   "title": "Noise",
   "description": "This track contains my tutorials on perlin and simplex noise.",
   "videos": [
-    "noc/perlin/graphing-1d-perlin-noise",
     "noc/perlin/intro-to-perlin-noise",
+    "noc/perlin/graphing-1d-perlin-noise",
     "noc/perlin/noise-vs-random",
     "noc/perlin/perlin-noise-2d",
     "noc/perlin/perlin-noise-detail",