Lazy load routed components

[damonhook]

As the size of this webapp grows, the initial load times will start to increase, this is because it needs to import everything at the entry point. We should change to lazy loading of these containers

E.g:

import About from 'containers/About';
import Home from 'containers/Home';
import PdfContainer from 'containers/PdfContainer';
import Simulations from 'containers/Simulations';

Becomes

const About = lazy(() => import('containers/About'));
const Home = lazy(() => import('containers/Home'));
const PdfContainer = lazy(() => import('containers/PdfContainer'));
const Simulations = lazy(() => import('containers/Simulations'));