fix: update hero selector for new CustomHero component

Author: Ondrej Machala

docs/.heroshot/config.json

@@ -11,7 +11,7 @@
       "viewports": ["desktop", "tablet", "mobile"],
       "name": "Hero",
       "url": "https://heroshot.sh/",
-      "selector": "#VPContent > div.VPHome > div.VPHero.has-image:nth-of-type(1)",
+      "selector": ".custom-hero",
       "scroll": {
         "x": 0,
         "y": 0