Public Engagement Page (#1372)

* Add public engagement page

- modifies sitemap config
- creates PublicEvent component
- adds SVGs for dates
- all copy is in intl

* Add Public Engagement button to each page

- create new PublicEng component
- add to each page
- update snapshots
- modify CEJST and Meth page to give button more space

* Make mobile compliant and fix DOM validation error

- transform each <p>'s descendent into a <CollectionDescription>
- fix a mobile rendering issue with <Collection> library
- format registration links so they render on mobile
- update snapshots

* Add spacing to descriptions and fix links

* Add Gherkin tests for testing links

- all zoom links should be functional
- ensure all legacy tests, test the new page
- add data-cy tag for cypress
- update snapshots

* Refactor to pass accessibility on all pages

- update snapshots

* Correct registration links

* Make registration links into buttons

* Make new tag bold

* Update copy based on feedback from Corey

client/src/components/PublicEvent/PublicEvent.test.tsx

@@ -0,0 +1,18 @@
+import * as React from 'react';
+import {render} from '@testing-library/react';
+import {LocalizedComponent} from '../../test/testHelpers';
+import PublicEvent from './PublicEvent';
+
+import * as PUBLIC_ENG_COPY from '../../data/copy/publicEngage';
+
+describe('rendering of the PublicEvent', () => {
+  const {asFragment} = render(
+      <LocalizedComponent>
+        <PublicEvent event={PUBLIC_ENG_COPY.EVENTS[0]}/>
+      </LocalizedComponent>,
+  );
+
+  it('checks if component renders', () => {
+    expect(asFragment()).toMatchSnapshot();
+  });
+});