use version.js for bullpen version

backend/config/version.js

@@ -0,0 +1 @@
+export const BULLPEN_VERSION = "1.1.0";

backend/controllers/info.controller.js

@@ -1,9 +1,10 @@
 const process = require('process');
+const {BULLPEN_VERSION} = require("../config/version");
 
 exports.info = (req, res) => {
     res.json({
         message: "Welcome to bullpen",
-        version: process.env.npm_package_version,
+        version: BULLPEN_VERSION,
         environment: process.env.NODE_ENV,
     });
 }