Expand the syntax documentation with a new section explaining Wren's script file format (.wren extension) and top-to-bottom execution model. Replace the previous "Literals" section with a comprehensive list of reserved words, and add a new "Newlines" section covering line break handling in the language.
Add full introductory content to the classes documentation page covering class definition, inheritance, and the Object superclass. Create a new usage documentation page with a TODO placeholder. Update the HTML page title format from "wren {title}" to "Wren - {title}" and add a navigation link to the new usage page.