fix: rm old theia dependency

server.js

+/**
+ * This file allow CORS for *.deadlock.io
+ * from the CORS middleware
+ * To generate the file you have to run Theia Docker-Java version from https://hub.docker.com/r/theiaide/theia-java
+ * then you will find this file under https://hub.docker.com/r/theiaide/theia-java in the container
+ */
+
+
 // @ts-check
 require('reflect-metadata');
 
@@ -50,6 +58,7 @@ function start(port, host, argv) {
     });
 }
 
+
 module.exports = (port, host, argv) => Promise.resolve()
     .then(function () { return Promise.resolve(require('@theia/process/lib/common/process-common-module')).then(load) })
     .then(function () { return Promise.resolve(require('@theia/process/lib/node/process-backend-module')).then(load) })
@@ -60,7 +69,6 @@ module.exports = (port, host, argv) => Promise.resolve()
     .then(function () { return Promise.resolve(require('@theia/file-search/lib/node/file-search-backend-module')).then(load) })
     .then(function () { return Promise.resolve(require('@theia/git/lib/node/git-backend-module')).then(load) })
     .then(function () { return Promise.resolve(require('@theia/git/lib/node/env/git-env-module')).then(load) })
-    .then(function () { return Promise.resolve(require('@theia/json/lib/node/json-backend-module')).then(load) })
     .then(function () { return Promise.resolve(require('@theia/terminal/lib/node/terminal-backend-module')).then(load) })
     .then(function () { return Promise.resolve(require('@theia/task/lib/node/task-backend-module')).then(load) })
     .then(function () { return Promise.resolve(require('@theia/debug/lib/node/debug-backend-module')).then(load) })