Improve service worker (#1353)

* Improve service worker

 - Add new env variable in WebPack "NODE_ENV"
 - Add new service worker for mode dev that permit to by pass response in cache storage
 - Add new WorkAdventure icon

* Remove console.log

* Add service worker file prod and dev

front/dist/service-worker.js

@@ -1,60 +0,0 @@
-let CACHE_NAME = 'workavdenture-cache-v1';
-let urlsToCache = [
-    '/'
-];
-
-self.addEventListener('install', function(event) {
-    // Perform install steps
-    event.waitUntil(
-        caches.open(CACHE_NAME)
-            .then(function(cache) {
-                return cache.addAll(urlsToCache);
-            })
-    );
-});
-
-self.addEventListener('fetch', function(event) {
-    event.respondWith(
-        caches.match(event.request)
-            .then(function(response) {
-                // Cache hit - return response
-                if (response) {
-                    return response;
-                }
-
-                return fetch(event.request).then(
-                    function(response) {
-                        // Check if we received a valid response
-                        if(!response || response.status !== 200 || response.type !== 'basic') {
-                            return response;
-                        }
-
-                        // IMPORTANT: Clone the response. A response is a stream
-                        // and because we want the browser to consume the response
-                        // as well as the cache consuming the response, we need
-                        // to clone it so we have two streams.
-                        var responseToCache = response.clone();
-
-                        caches.open(CACHE_NAME)
-                            .then(function(cache) {
-                                cache.put(event.request, responseToCache);
-                            });
-
-                        return response;
-                    }
-                );
-            })
-    );
-});
-
-self.addEventListener('wait', function(event) {
-    //TODO wait
-});
-
-self.addEventListener('update', function(event) {
-    //TODO update
-});
-
-self.addEventListener('beforeinstallprompt', (e) => {
-    //TODO change prompt
-});