update layouts

layouts/podcast.11ty.js

@@ -29,7 +29,7 @@ class PodcastFeed {
       description: data.description,
       feedUrl: `${data.site.url}${data.page.filePathStem}.xml`,
       siteUrl: data.site.url,
-      imageUrl: 'http://example.com/icon.png',
+      imageUrl: data.site.imageUrl || `${data.site.url}${data.page.filePathStem}.jpg`,
       author: data.author || `${data.site.author.name}`,
       copyright: data.copyright || `${new Date().getFullYear()} ${data.site.author.name}`,
       language: 'en',
@@ -45,7 +45,7 @@ class PodcastFeed {
       },
       itunesExplicit: data.itunes?.explicit || false,
       itunesCategory: [],
-      itunesImage: data.itunes?.image || 'http://example.com/image.png'
+      itunesImage: data.itunes?.image || data.site.imageUrl || `${data.site.url}${data.page.filePathStem}.jpg`
     });
 
     const episodes = data.collections.episode.filter(episode=>episode.data.podcast==true)