bump coolness and add thumb

Author: reczkok

apps/typegpu-docs/src/examples/image-processing/selfie-segmentation/meta.json

@@ -2,5 +2,5 @@
   "title": "Selfie Segmentation",
   "category": "image-processing",
   "tags": ["ai", "camera", "inference", "segmentation"],
-  "coolFactor": 8
+  "coolFactor": 10
 }