Gherkin cypress spike (#673)

* integrate gherkin/cucumber w/ cypress

- change cypress.json config from e2e back to standard integration
- add cypress-cucumber-preprocessor
- add integration test of about page

* add a title to each page

* add intl to the 404 page

* Refactor explore tool page

- add intl to static strings
- replace component css with <Grid> layout

* Add title to contact page

* add intl to title of page

* Add gherkin tests for nav to about page

- navigate from any page to the about page
- ensure each link has the title correct on that page

client/cypress/integration/LegacyTests/exploreToolPage.spec.js

@@ -0,0 +1,13 @@
+// / <reference types="Cypress" />
+
+describe('tests links on Explore Tool Page', () => {
+  it('validate file download', () => {
+    cy.visit('localhost:8000/en/cejst');
+
+    // Checks to make sure all a tags have an href:
+    cy.get('a').each(($a) => {
+      const message = $a.text();
+      expect($a, message).to.have.attr('href').not.contain('undefined');
+    });
+  });
+});