refactor: flow typing (#1012)

* fix: padding

* fix: Minor button alignment issues

* feat: Add icon to invite people button

* WIP

app/components/Analytics.js

@@ -2,7 +2,11 @@
 /* global ga */
 import * as React from 'react';
 
-export default class Analytics extends React.Component<*> {
+type Props = {
+  children?: React.Node,
+};
+
+export default class Analytics extends React.Component<Props> {
   componentDidMount() {
     if (!process.env.GOOGLE_ANALYTICS_ID) return;