Add image gallery block

CHDataManagement/Generator/Page Generators/FeedPageGenerator.swift

@@ -84,14 +84,7 @@ final class FeedPageGenerator {
     }
 
     func swiperInitScript(posts: [FeedEntryData]) -> String {
-        var result = "<script> window.onload = () => { "
-        for post in posts {
-            guard post.requiresSwiper else {
-                continue
-            }
-            result += ImageGallery.swiperInit(id: post.entryId)
-        }
-        result += "}; </script>"
-        return result
+        let ids = posts.filter { $0.requiresSwiper }.map { $0.entryId }
+        return ImageGallery.combinedFootor(ids: ids)
     }
 }