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

public/now.txt

@@ -0,0 +1,12 @@
+26/03/26
+
+still moving house. this one is mostly
+empty at this point; anything we don't
+need got thrown away, and things i can
+live without for a while got taken and
+put in storage closer to the new house
+
+seven months and counting+
+
+cheers,
+lew