Europa docs: From local dev to CI environment doc page

The todoapp example contains a Netlify plan which uses the latest dagger
additions: do & Client API. We are thinking of merging the examples
repository into this one to make working with this easier. This is a
step in that direction.

We are not using the yarn package so that we can revert
https://github.com/dagger/dagger/pull/1673 without breaking this
implementation.

The GitHub Action is WIP, we will continue with that tomorrow:
https://github.com/dagger/dagger-for-github/issues/24

Signed-off-by: Gerhard Lazu <gerhard@lazu.co.uk>

pkg/universe.dagger.io/examples/todoapp/src/index.js

@@ -0,0 +1,18 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+
+
+const DATA = [
+  { id: "todo-0", name: "Eat", completed: true },
+  { id: "todo-1", name: "Sleep", completed: false },
+  { id: "todo-2", name: "Repeat", completed: false }
+];
+
+ReactDOM.render(
+  <React.StrictMode>
+    <App tasks={DATA} />
+  </React.StrictMode>,
+  document.getElementById('root')
+);