Add client-side routing

src/components/pages/Tickets.js

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+import React, { Component } from 'react';
+
+import Header from '../Header.js'
+import MainArea from '../MainArea.js'
+
+class Tickets extends Component {
+    render() {
+        return (
+            <>
+                <Header title="Biljetter" />
+                <MainArea />
+            </>
+        );
+    }
+}
+
+export default Tickets;

src/components/pages/TicketsBuy.js

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+import React, { Component } from 'react';
+
+import Header from '../Header.js'
+import MainArea from '../MainArea.js'
+
+class TicketsBuy extends Component {
+    render() {
+        return (
+            <>
+                <Header title="Köp biljett" />
+                <MainArea />
+            </>
+        );
+    }
+}
+
+export default TicketsBuy;

src/components/pages/Travel.js

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+import React, { Component } from 'react';
+
+import Header from '../Header.js'
+import MainArea from '../MainArea.js'
+
+class Travel extends Component {
+    render() {
+        return (
+            <>
+                <Header title="Reseplanering" />
+                <MainArea />
+            </>
+        );
+    }
+}
+
+export default Travel;