Clarify how to run everything

homelab/README.md

@@ -1,3 +1,11 @@
 My homelab now uses runit-managed podman containers.
 
-runit essentially runs `*/run` in an endless loop.
+If, for some reason,
+`runit` and all its variants disappear,
+you can get everything going this way:
+
+```sh
+for service in */; do
+  (cd $service && ./run) &
+done
+```