External files, improve page generation

CHDataManagement/Preview Content/File+Mock.swift

@@ -2,6 +2,6 @@
 extension FileResource {
 
     static var mock: FileResource {
-        .init(content: .mock, id: "my-file.txt", en: "Some text file", de: "Eine Textdatei")
+        .init(content: .mock, id: "my-file.txt", isExternallyStored: true, en: "Some text file", de: "Eine Textdatei")
     }
 }

CHDataManagement/Preview Content/Page+Mock.swift

@@ -19,6 +19,7 @@ extension Page {
 extension LocalizedPage {
 
     static let english = LocalizedPage(
+        content: .mock,
         urlString: "my-project",
         title: "My First Project",
         lastModified: nil,
@@ -28,6 +29,7 @@ extension LocalizedPage {
         requiredFiles: [])
 
     static let german = LocalizedPage(
+        content: .mock,
         urlString: "mein-projekt",
         title: "Mein Erstes Projekt",
         lastModified: nil,

CHDataManagement/Preview Content/WebsiteData+Mock.swift

@@ -21,7 +21,7 @@ extension PostSettings {
 extension PageSettings {
 
     static var mock: PageSettings {
-        .init(pageUrlPrefix: "pages", contentWidth: 600)
+        .init(pageUrlPrefix: "pages", contentWidth: 600, largeImageWidth: 1200)
     }
 }