Revert "create cache-buster/"

This reverts commit b10a2d246cf6bc7dbce97f3148d90ec7d1e5a3a3.

start.sh

@@ -5,7 +5,7 @@ set -eu
 mongo_cli="mongo ${MONGODB_HOST}:${MONGODB_PORT}/${MONGODB_DATABASE} -u ${MONGODB_USERNAME} -p ${MONGODB_PASSWORD}"
 
 echo "=> Creating directories"
-mkdir -p /app/data/public/uploads /run/nodebb/logs /run/nodebb/public /run/nodebb/node_modules /run/nodebb/npm /run/nodebb/build/cache-buster
+mkdir -p /app/data/public/uploads /run/nodebb/logs /run/nodebb/public /run/nodebb/node_modules /run/nodebb/npm /run/nodebb/build
 
 export NODE_ENV=production
 export NODE_PATH=/app/code/node_modules