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/cypress/support/step_definitions/commonSteps.js

@@ -62,3 +62,7 @@ And(`I click on the {string} {string} link`, (ctaString, type) => {
 And(`I click on the {string} footer link`, (string) => {
   cy.get(`[data-cy="${hyphenizeString(string)}"]`).as('externalLink');
 });
+
+And(`I click on the {string} event`, (string) => {
+  cy.get(`[data-cy="${hyphenizeString(string)}-block"]`).as('externalLink');
+});