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/coredns/install.sh

@@ -2,13 +2,15 @@
 set -e
 set -o pipefail
 
-if [ -z "${WC_HOME}" ]; then
-    echo "Please source the wildcloud environment first. (e.g., \`source ./env.sh\`)"
+# Initialize Wild-Cloud environment
+if [ -z "${WC_ROOT}" ]; then
+    print "WC_ROOT is not set."
     exit 1
+else
+    source "${WC_ROOT}/scripts/common.sh"
+    init_wild_env
 fi
 
-source "${WC_ROOT}/bin/wild-common.sh"
-
 CLUSTER_SETUP_DIR="${WC_HOME}/setup/cluster"
 COREDNS_DIR="${CLUSTER_SETUP_DIR}/coredns"