Summary: Robin Sloan adds a new Shop section and privacy statement

Why It Matters: The site is moving toward a more traditional navigation structure. It now includes a direct link to a shop and a clear statement about user privacy and data collection.

What Changed:

• Added a new navigation menu at the top with links to Home, About, Moonbound, and Shop.
• Added a privacy statement at the bottom of the page.
• Included a link to a "colophon" page in the footer.
• Updated the header formatting to include the author's name more prominently.