Demo business removal

Removed the demo business as its easier to just provision one manually.

stacks/infra/sites/.gitkeep

@@ -2,8 +2,8 @@ Keeps this otherwise-empty directory tracked in git.
 
 Each business gets its own <slug>.caddy file here, e.g.:
 
-  demo-business.example.com {
-  	reverse_proxy next-chair-demo-business:3000
+  example-business.example.com {
+  	reverse_proxy next-chair-example-business:3000
   }
 
 Generated by the management UI (manager/) when a business is added, or