Add documentation management and reorganize scaffold docs

- Add wild-setup-docs command to copy documentation to cloud projects
- Move node setup guide from scaffold to main docs/guides/
- Add app workflow guide to main docs/guides/
- Update cluster installation scripts to use standard env initialization

setup/cluster/longhorn/install.sh

@@ -11,8 +11,6 @@ else
     init_wild_env
 fi
 
-source "${WC_ROOT}/bin/wild-common.sh"
-
 CLUSTER_SETUP_DIR="${WC_HOME}/setup/cluster"
 LONGHORN_DIR="${CLUSTER_SETUP_DIR}/longhorn"