Remove tools/services.md and add stackblitz.md

app/3.0/docs/stackblitz.md

@@ -0,0 +1,36 @@
+---
+title: "Polymer 3.0 on Stackblitz"
+---
+
+<!-- toc -->
+
+[StackBlitz](https://stackblitz.com) is an online editor for web projects. You can use StackBlitz to prototype and preview Polymer elements.
+
+Here's a [template for Polymer 3.0 to help you get started](https://stackblitz.com/edit/start-polymer3?file=start-polymer3.js). 
+
+Please note that at the time of writing, StackBlitz requires an `index.js` and `index.html` file to be present in the root folder for all JavaScript projects. You'll need to import your app shell from `index.js`, like so:
+
+index.js {.caption}
+
+```
+import `my-app.js`;
+```
+
+index.html {.caption}
+```
+<!-- StackBlitz compiles es6 code to es5 for compatibility with older browsers. Include the custom elements adapter to make your code work in ES6-native browsers. -->
+<script src="node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
+
+<my-app></my-app>
+```
+
+my-app.js {.caption}
+```
+import PolymerElement from '@polymer/polymer/polymer-element.js';
+
+class MyApp extends PolymerElement {
+  ...
+}
+
+window.customElements.define('my-app', MyApp);
+```

app/3.0/nav.yaml

@@ -151,9 +151,6 @@
   - title: Publish your elements
     path: /3.0/docs/tools/publish
     indent: True
-  - title: Web services
-    path: /3.0/docs/tools/services
-    indent: True
   - title: polymer.json specification
     path: /3.0/docs/tools/polymer-json
     indent: True
@@ -165,6 +162,9 @@
   - title: Glossary
     path: /3.0/docs/glossary
     indent: True
+  - title: Polymer 3.0 on StackBlitz
+    path: /3.0/docs/stackblitz
+    indent: True
   - endheader: True
   - header: API Reference
   - title: API Reference