disable cors-proxy by default (#1551)

Author: angelo-v

docker-image/src/Dockerfile

@@ -23,7 +23,7 @@ ENV SOLID_ROOT=${SOLID_HOME}/data
 ENV SOLID_SSL_KEY=${SOLID_HOME}/${TEMPORARY_CERT_NAME}.key
 ENV SOLID_SSL_CERT=${SOLID_HOME}/${TEMPORARY_CERT_NAME}.crt
 ENV SOLID_PORT=8443
-ENV SOLID_CORS_PROXY=/xss
+ENV SOLID_CORS_PROXY=false
 ENV DEBUG=solid:*
 
 VOLUME $SOLID_HOME