Prep Martha Jun Wk2 (centralized config + Penpot review)

## Must complete by Monday June 8 sync - [ ] Review Martha's content collection from Wk1 — verify schema is correct, data renders on page - [ ] Prepare a siteConfig.ts example if the guide isn't enough (some people need to see a working file) - [ ] Review Martha's Penpot design for GreenScape — gallery section is new, ensure layout works for image-heavy content - [ ] Prepare Monday sync: review Wk1 deliverable, assign Wk2 tasks