Add timeline page (#105)

* Add timeline page
* Factor out common aside into component.
* Update J40Footer.spec.tsx.snap
TODO: Get nav menu working.

client/src/components/J40Aside.tsx

@@ -0,0 +1,56 @@
+import * as React from 'react';
+
+// @ts-ignore
+import chatIcon from '/node_modules/uswds/dist/img/usa-icons/chat.svg';
+// @ts-ignore
+import githubIcon from '/node_modules/uswds/dist/img/usa-icons/github.svg';
+
+const J40Aside = () => {
+  return (
+    <>
+      <aside
+        aria-labelledby="left-sidebar"
+        className={'j40-aside desktop:grid-col-3'}
+        id="left-sidebar">
+        <section
+          className={'usa-prose grid-gap grid-container usa-section'}>
+          <h3 className={'j40-aside-title'}>Get Involved</h3>
+          <h5>
+            <img
+              className={'flex-align-self-center width-4'} src={chatIcon}
+              alt={'chat icon'}/>
+            <br/>
+          Send Feedback
+          </h5>
+          <p>Have ideas about how to acknowledge the on-the-ground
+          experiences of your community?
+          </p>
+        Email: <a href="mailto: justice40open@usds.gov">
+        justice40open@usds.gov</a>
+          <p>&nbsp;</p>
+          <h5>
+            <img
+              className={'flex-align-self-center width-4'}
+              src={githubIcon} alt={'github icon'}/>
+            <br/>
+          Join the open source community</h5>
+          <p>
+          Justice40’s code is open source, which means it is available for
+          the public to view and contribute. Anyone can view and
+          contribute on GitHub.
+          </p>
+          <p>
+            <a
+              href={'https://github.com/usds/justice40-tool/' +
+            'crisis-at-home-and-abroad/'}
+              target={'_blank'}
+              rel={'noreferrer'}
+              key={'github3'}>Check it out on GitHub</a>
+          </p>
+        </section>
+      </aside>
+    </>
+  );
+};
+
+export default J40Aside;

client/src/components/J40Footer.tsx

@@ -11,8 +11,7 @@ const J40Footer = () => {
         primary={<></>}
         secondary={<FooterNav
           aria-label="Footer navigation"
-          size="big" // fyi you leave this off and it silently fails... lovely
-          className={'nobreak'}
+          size="big" // fyi you leave this off and it silently fails...
           links={[
             [
               'Agency Partners',

client/src/components/__snapshots__/J40Footer.spec.tsx.snap

@@ -16,7 +16,7 @@ exports[`J40Footer renders correctly 1`] = `
       >
         <nav
           aria-label="Footer navigation"
-          class="usa-footer__nav nobreak"
+          class="usa-footer__nav"
         >
           <div
             class="grid-row grid-gap-4"