Add page settings, improve settings UI

CHDataManagement/Views/Settings/LocalizedPostFeedSettingsView.swift

@@ -13,14 +13,18 @@ struct LocalizedPostFeedSettingsView: View {
                 .textFieldStyle(.roundedBorder)
                 .frame(maxWidth: 400)
             Text("The title of all post feed pages.")
+                .foregroundStyle(.secondary)
                 .padding(.bottom)
+
             Text("URL prefix")
                 .font(.headline)
             TextField("", text: $settings.feedUrlPrefix)
                 .textFieldStyle(.roundedBorder)
                 .frame(maxWidth: 400)
             Text("The prefix to generate the urls for all post feed pages.")
+                .foregroundStyle(.secondary)
                 .padding(.bottom)
+
             Text("Description")
                 .font(.headline)
             TextEditor(text: $settings.description)
@@ -33,6 +37,7 @@ struct LocalizedPostFeedSettingsView: View {
                 .background(Color.gray.opacity(0.1))
                 .cornerRadius(8)
             Text("The description of all post feed pages.")
+                .foregroundStyle(.secondary)
                 .padding(.bottom)
         }
     }