Add navigation settings, fix page generation

CHDataManagement/Generator/Post Lists/PostListPageGeneratorSource.swift

@@ -0,0 +1,17 @@
+
+protocol PostListPageGeneratorSource {
+
+    var language: ContentLanguage { get }
+
+    var content: Content { get }
+
+    var results: PageGenerationResults { get }
+
+    var showTitle: Bool { get }
+
+    var pageTitle: String { get }
+
+    var pageDescription: String { get }
+
+    func pageUrlPrefix(for language: ContentLanguage) -> String
+}