Replace URLImage with AsyncImage

Shared/PearvidiousApp.swift

@@ -1,15 +1,10 @@
 import SwiftUI
-import URLImage
-import URLImageStore
 
 @main
 struct PearvidiousApp: App {
     var body: some Scene {
-        let urlImageService = URLImageService(fileStore: URLImageFileStore(),
-                                              inMemoryStore: URLImageInMemoryStore())
         WindowGroup {
             ContentView()
-                .environment(\.urlImageService, urlImageService)
         }
     }
 }