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/common/i_see_string_in_the_title.js

@@ -0,0 +1,4 @@
+// eslint-disable-next-line new-cap
+Then(`I see {string} in the title`, (title) => {
+  cy.title().should('include', title);
+});