refactor: use pages/ at root for Git sync

- Flatten structure: pages/{fqdn}/pages/ -> pages/{fqdn}/
 (etc)
- Updated setup.php for point directly at user/pages/{hostname}/
 (envPath . '/pages')
- Git sync will sync 'pages/' folder to user/pages/

Assisted-by: GLM-5 via Crush <crush@charm.land>

pages/plan.ezpodstack.org/dev.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+mdbook \
+    serve \
+    . \
+    -p 3001 \
+    -d book \