feat(pages/learn): use new image for learn hub hero

Author: TylerAPfledderer

src/assets/ethereum-eth2.png

@@ -28,12 +28,12 @@ const mockGatsbyImgData: IGatsbyImageData = {
   layout: "fullWidth",
   images: {
     fallback: {
-      src: "/ethereum-eth2.png",
+      src: "/heroes/learn-hub-hero.png",
       sizes: "100vw",
     },
     sources: [
       {
-        srcSet: "/ethereum-eth2.png",
+        srcSet: "/heroes/learn-hub-hero.png",
         type: "image/webp",
         sizes: "100vw",
       },

src/assets/heroes/learn-hub-hero.png

@@ -806,7 +806,7 @@ export const query = graphql`
         }
       }
     }
-    heroImage: file(relativePath: { eq: "ethereum-eth2.png" }) {
+    heroImage: file(relativePath: { eq: "heroes/learn-hub-hero.png" }) {
       childImageSharp {
         gatsbyImageData(
           width: 1504