Delete unused file

app/backend/appInfo.js

@@ -1,33 +0,0 @@
-import * as packageJSON from '../package.json';
-
-export function getAppVersion () {
-  return packageJSON.version;
-}
-
-export function getAppLongName () {
-  return packageJSON.longName;
-}
-
-export function getAppName () {
-  return packageJSON.productName;
-}
-
-export function getAppPlatform () {
-  return process.platform;
-}
-
-export function getAppEnvironment () {
-  return process.env.INSOMNIA_ENV || 'unknown';
-}
-
-export function isMac () {
-  return getAppPlatform() === 'darwin';
-}
-
-export function isDevelopment () {
-  return getAppEnvironment() === 'development';
-}
-
-export function getClientString () {
-  return `${getAppEnvironment()}::${getAppPlatform()}::${getAppVersion()}`
-}