Adding Cypress for e2e testing (#85)

* using the higher-level react-testing-library, and regenerating snapshot - renders real DOM elements
* Basic e2e testing with Cypress, following the guide here: https://www.gatsbyjs.com/docs/how-to/testing/end-to-end-testing/ ; needed to install cypress-local to avoid jest-cypress collision
* Adding accessibility testing support and basic a11y tests
* adding failure logging
* Adding nightly test run
* Fix misc stuff from lighthouse (#81)
* Removing local-cypress, relying instead on a combination
of type reference and eslint-plugin-cypress;
adding cypress to jest ignore paths to avoid conflict -
`npm test` is now jest-only, use `npm run test:e2e` to run cypress tests
* updating comment to clarify timezone

client/jest.config.js

@@ -9,11 +9,14 @@ module.exports = {
     // eslint-disable-next-line max-len
     '.+\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$': `<rootDir>/__mocks__/file-mock.js`,
   },
-  testPathIgnorePatterns: [`node_modules`, `\\.cache`, `<rootDir>.*/public`],
+  testPathIgnorePatterns: [`node_modules`, `\\.cache`,
+    `<rootDir>/public`,
+    `<rootDir>/cypress`],
   transformIgnorePatterns: [`node_modules/(?!(gatsby)/)`],
   globals: {
     __PATH_PREFIX__: ``,
   },
   testURL: `http://localhost`,
   setupFiles: [`<rootDir>/loadershim.js`],
+  setupFilesAfterEnv: ['<rootDir>/setup-test-env.js'],
 };