Shared assets, cleanup for initial deploy

server/pages/components/SignupButton.js

@@ -0,0 +1,19 @@
+// @flow
+import React from 'react';
+import styled from 'styled-components';
+import { color } from '../../../shared/styles/constants';
+
+const SlackSignin = () => {
+  return <Button href="/auth/slack">Sign In with Slack</Button>;
+};
+
+const Button = styled.a`
+  display: inline-block;
+  padding: 10px 20px;
+  color: ${color.white};
+  background: ${color.black};
+  border-radius: 4px;
+  font-weight: 500;
+`;
+
+export default SlackSignin;