Troubleshooting images link for thank-you page.
Fixed header.css link in default HTML.
Created category folders for books and placed images inside them.
Made md files for each product, added YAML information.
Moved book images into category folders. Deleted one image.
Removed content from thank you page except the title.
Changed links to images in HTML so they work.
Created a Books menu item.
Index files for product pages are created with Jeckyll.
Created filter HTML files.
Created index file for books page.
Put books HTML file into layouts folder, added some code.
Changed title.