Merge pull request #1574 from CodingTrain/marbling-challenge

Add marbling challenge

Author: shiffman

content/pages/challenges/index.json

@@ -2,5 +2,5 @@
   "title": "Challenges",
   "description": "Ready to apply what you’ve learned in the Tracks? Try a Challenge! These one-off project videos build off concepts introduced in Tracks and may have prerequisites (listed on the challenge page itself).",
   "featuredText": "Featured Challenge:",
-  "featuredChallenge": "182-apollonian-gasket"
+  "featuredChallenge": "183-mathematical-marbling"
 }

content/pages/homepage/index.json

@@ -31,7 +31,7 @@
     "title": "Challenges",
     "description": "Watch Dan take on Coding Challenges in p5.js and Processing. The challenge topics include algorithmic art, machine learning, simulation, generative poetry, and more.",
     "featured": [
-      "182-apollonian-gasket",
+      "183-mathematical-marbling",
       "17-fractal-trees-space-colonization",
       "173-snake-applesoft-basic",
       "83-p5-sketch-chrome-extension",