Update index.json

add the latest showcases

Author: kfahn22

content/pages/homepage/index.json

@@ -47,14 +47,14 @@
   "passengerShowcase": {
     "title": "Passenger showcase highlights",
     "featured": [
-      "challenges/182-apollonian-gasket/showcase/contribution-1711110753.json",
-      "challenges/182-apollonian-gasket/showcase/contribution-1711767675.json",
-      "challenges/182-apollonian-gasket/showcase/contribution-1711308188.json",
-      "challenges/166-image-to-ascii/showcase/contribution-1711741187.json",
-      "challenges/154-tic-tac-toe-minimax/showcase/contribution-1710990124.json",
-      "challenges/96-visualizing-digits-of-pi/showcase/contribution-1711590403.json",
-      "challenges/52-random-walker/showcase/contribution-1710758696.json",
-      "challenges/179-wolfram-ca/showcase/contribution-1710949601.json"
+      "code/2-variables/5-map/showcase/contribution-1713120295.json",
+      "challenges/180-falling-sand/showcase/contribution-1713541543.json",
+      "noc/4-particles/2-particle-emitters/showcase/contribution-1711836756.json",
+      "challenges/90-dithering/showcase/contribution-1711892032.json",
+      "challenges/4-purple-rain/showcase/contribution-1687374037.json",
+      "challenges/171-wave-function-collapse/showcase/contribution-1688140264.json",
+      "challenges/43-context-free-grammar/showcase/contribution1.json",
+      "webgl/2-3d-geometries/showcase/contribution-1710194669.json"
     ],
     "showcaseCta": {
       "text": "Want to see more?",