put js and css files to assets locally

lint`

apps/remix-ide/src/app.js

@@ -507,6 +507,6 @@ Please make a backup of your contracts and start using http://remix.ethereum.org
 
   const walkthroughService = new WalkthroughService(localStorage)
   if (!params.code) {
-      walkthroughService.start()
+    walkthroughService.start()
   }
 }

apps/remix-ide/src/index.html

@@ -118,6 +118,6 @@
 		<script src="polyfills.js" type="module"></script>
 		<script src="vendor.js" type="module"></script>
 		<script src="https://kit.fontawesome.com/41dd021e94.js" crossorigin="anonymous"></script>
-		<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/intro.js/4.1.0/intro.min.js"></script>
+		<script type="text/javascript" src="assets/js/intro.min.js"></script>
 	</body>
 </html>

apps/remix-ide/src/walkthroughService.js

@@ -0,0 +1,48 @@
+const introJs = require('intro.js')
+
+export class WalkthroughService {
+  constructor (params) {
+    this.params = params
+  }
+
+  start (params) {
+    if (!localStorage.getItem('hadTour_initial')) {
+      introJs().setOptions({
+        steps: [{
+          title: 'Welcome to Remix IDE',
+          intro: 'Click to launch the Home tab that contains links, tips, and shortcuts..',
+          element: document.querySelector('#verticalIconsHomeIcon'),
+          tooltipClass: 'bg-light text-dark',
+          position: 'right'
+        },
+        {
+          element: document.querySelector('#compileIcons'),
+          title: 'Solidity Compiler',
+          intro: 'Having selected a .sol file in the File Explorers(the icon above), compile it with the Solidity Compiler.',
+          tooltipClass: 'bg-light text-dark',
+          position: 'right'
+        },
+        {
+          title: 'Deploy your contract',
+          element: document.querySelector('#runIcons'),
+          intro: 'Choose a chain, deploy a contract and play with your functions.',
+          tooltipClass: 'bg-light text-dark',
+          position: 'right'
+        },
+        {
+          title: 'The plugins world',
+          element: document.querySelector('#settingsIcons'),
+          intro: 'Explore more plugins and manage permissions.',
+          tooltipClass: 'bg-light text-dark',
+          position: 'right',
+          doneLabel: 'Done!'
+        }
+        ]
+      }).start()
+      localStorage.setItem('hadTour_initial', true)
+    }
+  }
+
+  startFeatureTour () {
+  }
+}