flatten monorepo, migrate off Vercel

- Remove penfield (split to own repo on Forgejo)
- Move www/ contents to root, rename to wynne.rs
- Swap @astrojs/vercel for @astrojs/node, upgrade to Astro 6
- Remove auth-astro/GitHub OAuth (TinyAuth at proxy layer)
- Remove Vercel deploy webhook
- Switch to local SQLite DB (drop Turso)
- Update generate-stats.js for new build output paths

content/bookmarks.yaml

@@ -0,0 +1,19 @@
+- date: 2026-01-23
+  title: personal websites with a /now page
+  url: https://nownownow.com/
+
+- date: 2025-04-18
+  title: accessible uk train timetables
+  url: https://traintimes.org.uk/
+
+- date: 2024-05-20
+  title: game programming patterns
+  url: https://gameprogrammingpatterns.com/contents.html
+
+- date: 2023-09-04
+  title: procedural map generation techniques
+  url: https://www.youtube.com/watch?v=TlLIOgWYVpI
+
+- date: 2023-09-04
+  title: procedural level design in brogue and beyond
+  url: https://www.youtube.com/watch?v=Uo9-IcHhq_w