Remove some instances of "starter kit"

Rename some files and change some identifiers to be neutral to the
application name. This makes it simpler to change everything to a proper
name when cloning this project.

Document in the README how to find the remaining places to change.

Closes #20

src/app.jsx

@@ -0,0 +1,43 @@
+/*jshint esversion: 6 */
+/*
+ * This file is part of Cockpit.
+ *
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * Cockpit is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * Cockpit is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Cockpit; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import cockpit from 'cockpit';
+import React from 'react';
+
+export class Application extends React.Component {
+    constructor() {
+        super();
+
+        cockpit.file('/etc/hostname').read().done((content) => {
+            this.setState({ 'hostname': content.trim() });
+        });
+    }
+
+    render() {
+        return (
+            <div className="container-fluid">
+                <h2>Starter Kit</h2>
+                <div>
+                    <span>Running on {this.state.hostname}</span>
+                </div>
+            </div>
+        );
+    }
+}