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.suborbital-systems.com/team-sweng/crossCompiler-avr.md

@@ -0,0 +1,4 @@
+
+CNW 05/27/2021 at 11:19 am
+
+https://github.com/arduino/toolchain-avr