Move renderWarnings from shared to client

Moving this component to the component folder so it's closer to where it is actually used.  Not moving to the `homebrew` folder because ultimately i think pretty much everything in that folder should move to the components as well (`homebrew` isn't a helpful folder distinction).

Deletes a directory, moves 2 files.

client/components/renderWarnings/renderWarnings.jsx

@@ -0,0 +1,60 @@
+require('./renderWarnings.less');
+const React = require('react');
+const createClass = require('create-react-class');
+const _     = require('lodash');
+
+import Dialog from '../dialog.jsx';
+
+const RenderWarnings = createClass({
+	displayName     : 'RenderWarnings',
+	getInitialState : function() {
+		return {
+			warnings : {}
+		};
+	},
+	componentDidMount : function() {
+		this.checkWarnings();
+		window.addEventListener('resize', this.checkWarnings);
+	},
+	componentWillUnmount : function() {
+		window.removeEventListener('resize', this.checkWarnings);
+	},
+	warnings : {
+		chrome : function(){
+			const isChrome = /Chrome/.test(navigator.userAgent) && /Google Inc/.test(navigator.vendor);
+			if(!isChrome){
+				return <li key='chrome'>
+					<em>Built for Chrome </em> <br />
+					Other browsers have not been tested for compatibility. If you
+					experience issues with your document not rendering or printing
+					properly, please try using the latest version of Chrome before
+					submitting a bug report.
+				</li>;
+			}
+		},
+	},
+	checkWarnings : function(){
+		this.setState({
+			warnings : _.reduce(this.warnings, (r, fn, type)=>{
+				const element = fn();
+				if(element) r[type] = element;
+				return r;
+			}, {})
+		});
+	},
+	render : function(){
+		if(_.isEmpty(this.state.warnings)) return null;
+
+		const DISMISS_KEY = 'dismiss_render_warning';
+		const DISMISS_TEXT = <i className='fas fa-times dismiss' />;
+
+		return <Dialog className='renderWarnings' dismissKey={DISMISS_KEY} closeText={DISMISS_TEXT}>
+			<i className='fas fa-exclamation-triangle ohno' />
+			<h3>Render Warnings</h3>
+			<small>If this homebrew is rendering badly if might be because of the following:</small>
+			<ul>{_.values(this.state.warnings)}</ul>
+		</Dialog>;
+	}
+});
+
+module.exports = RenderWarnings;