Update link to github repo

I have a much better version of the L-system pattern generator deployed to github pages.

Author: kfahn22

content/videos/challenges/16-l-system-fractal-trees/showcase/contribution-1723243364.jpg

@@ -1,9 +1,9 @@
 {
-  "title": "L-System Generator with Shapes",
+  "title": "L-System Pattern Generator with Polar Shapes",
   "author": {
     "name": "Kathy McGuiness"
   },
-  "url": "https://editor.p5js.org/kfahn/sketches/B_P7q5oG_",
+  "url": "https://github.com/kfahn22/L-System-Pattern-Generator",
   "submittedOn": "2024-08-09T22:42:44.780Z",
   "socialPermission": true
 }