Demo business removal

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

manager/Dockerfile

@@ -6,9 +6,9 @@
 #
 # Only one instance of this ever runs (unlike the business image, which
 # is built once and reused across every business — see
-# stacks/demo-business/compose.yaml's own note) so a per-deploy `build:`
-# in stacks/manager/compose.yaml, rather than a separately tagged image,
-# is the simpler choice here.
+# src/lib/compose-template.ts's own note) so a per-deploy `build:` in
+# stacks/manager/compose.yaml, rather than a separately tagged image, is
+# the simpler choice here.
 
 FROM node:22-alpine AS deps
 WORKDIR /app