Adds action to open website page

Author: Chris Jakeman

Source/Documentation/Use this folder to store.txt

@@ -1,4 +1,6 @@
 In Source\Documentation\ to store source for documents useful in running Open Rails.
+This applies to core Open Rails and also to non-core (or "contributed" programs.
+
 They should be MS Office or OpenOffice format and will be processed to PDF format which is distributed as part of the installation and available to users in the drop-down Menu > Documents
 
 Other documents should be stored in Source\Documentation\Online and these are all available on the website via a link in the drop-down.

Source/Documentation/Online/timetable-editor_de.docx renamed to Source/Documentation/timetable-editor_de.docx

@@ -243,6 +243,7 @@ orderby tool.Text
                 var docs = new List<ToolStripItem>();
                 var dir = Directory.GetCurrentDirectory();
                 var path = dir + @"\Documentation\";
+
                 if (Directory.Exists(path))
                 {
                     // Load English documents
@@ -259,7 +260,13 @@ orderby tool.Text
                             LoadDocuments(docs, codePath, code);
                     }
                 }
-                else buttonDocuments.Enabled = false;
+
+                var item = new ToolStripMenuItem($"Online documents (opens browser)", null, (object sender2, EventArgs e2) =>
+                    {
+                        Process.Start("https://www.openrails.org/learn/docs-list/");
+                    }
+                );
+                contextMenuStripDocuments.Items.Add(item);
 
                 NotificationManager = new NotificationManager(this, this.Resources, UpdateManager, Settings, panelDetails);
             }