Update featured challenges and showcases (#1977)

Author: kfahn22

content/pages/homepage/index.json

@@ -31,12 +31,12 @@
     "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": [
-      "11-3d-terrain-generation-with-perlin-noise",
-      "27-fireworks",
+      "c1-maurer-rose",
+      "171-wave-function-collapse",
       "187-bayesian-text-classification",
-      "109-visualizing-500000-subscribers",
-      "c5-marching-squares",
-      "146-rendering-ray-casting"
+      "116-lissajous-curve-table",
+      "108-barnsley-fern",
+      "31-flappy-bird"
     ],
     "challengesCta": {
       "text": "ready to explore? try a challenge!",
@@ -47,14 +47,14 @@
   "passengerShowcase": {
     "title": "Passenger showcase highlights",
     "featured": [
-      "challenges/182-apollonian-gasket/showcase/contribution-1759437109.json",
-      "code/7-arrays/6-object-communication-1/showcase/contribution-1759856331.json",
-      "challenges/145-ray-casting-2d/showcase/contribution-1759839401.json",
-      "code/7-arrays/5-removing-elements/showcase/contribution-1756652444.json",
-      "challenges/119-binary-to-decimal-conversion/showcase/contribution-1756678732.json",
-      "challenges/180-falling-sand/showcase/contribution-1756678486.json",
-      "code/3-conditionals/4-boolean/showcase/contribution-1758653305.json",
-      "challenges/171-wave-function-collapse/showcase/contribution-1743446782.json"
+      "noc/perlin/perlin-noise-2d/showcase/contribution-1772933208.json",
+      "challenges/24-perlin-noise-flow-field/showcase/contribution-1771770542.json",
+      "code/1-intro/3-shapes-drawing/showcase/contribution-1767708774.json",
+      "challenges/c2-collatz-conjecture/showcase/contribution-1765757484.json",
+      "challenges/17-fractal-trees-space-colonization/showcase/contribution-1762460928.json",
+      "p5js-2.0/async-await/showcase/contribution-1761434263.json",
+      "code/7-arrays/4-mouse-interaction/showcase/contribution-1773358210.json",
+      "code/3-conditionals/4-boolean/showcase/contribution-1768741945.json"
     ],
     "showcaseCta": {
       "text": "Want to see more?",