Update index.json

add dragon curve to featured challenges

Author: kfahn22

content/pages/homepage/index.json

@@ -32,11 +32,11 @@
     "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": [
       "185-dragon-curve",
-      "64-kinematics",
-      "125-fourier-series",
-      "28-metaballs",
-      "116-lissajous-curve-table",
-      "170-monty-hall-problem"
+      "175-3D-cube-applesoft-basic",
+      "160-spring-forces",
+      "113-4d-hypercube-aka-tesseract",
+      "99-neural-network-color-predictor",
+      "85-the-game-of-life"
     ],
     "challengesCta": {
       "text": "ready to explore? try a challenge!",