Added manual pages to last mod tracking

lib/page_modification_tracker.rb

@@ -15,6 +15,10 @@ def initialize(host: "localhost:3000", selector: "body")
     end
   end
 
+  def pages
+    published_pages
+  end
+
   def track_page_modifications
     published_pages.each_key do |path|
       response = request_path(path, @app, @headers)
@@ -49,7 +53,13 @@ def published_pages
     )
     content_pages = ::Pages::Frontmatter.list.reject { |_path, fm| fm[:draft] }
     event_pages = events.map { |e| Rails.application.routes.url_helpers.event_path(e.readable_id) }.index_with({})
-    content_pages.merge(event_pages)
+    manual_pages = {
+      "/events/about-get-into-teaching-events" => {},
+      "/events" => {},
+      "/mailinglist/signup/name" => {}
+    }
+
+    content_pages.merge(**event_pages, **manual_pages)
   end
 
   def request_path(path, app, headers)