Add E2E cypress tests.

tests/.gitignore

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+node_modules

tests/cypress.config.js

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+const { defineConfig } = require("cypress");
+
+module.exports = defineConfig({
+  e2e: {
+    setupNodeEvents(on, config) {
+      // implement node event listeners here
+    },
+  },
+});

tests/cypress/e2e/happy_path.cy.js

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+const checkThatNavBarExists = ( ) =>{
+    cy.get('nav').contains(/api docs/i).parent().parent().within(() => {
+      cy.contains(/api docs/i)
+      cy.contains(/examples/i)
+      cy.contains(/blog/i)
+      cy.contains(/user manual/i)
+    })
+  }
+
+
+
+  describe('E2E Tests', () => {
+    it('can view / (landing page)', () => {
+      cy.visit('http://localhost:3000')
+      checkThatNavBarExists()
+      cy.contains(/The Universal Quantum Toolkit/i)
+      cy.contains(/pip install pytket/i)
+      cy.contains(/build/i)
+      cy.contains(/compile/i)
+      cy.contains(/run/i)
+
+    })
+
+
+  })

tests/cypress/fixtures/example.json

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+{
+  "name": "Using fixtures to represent data",
+  "email": "hello@cypress.io",
+  "body": "Fixtures are a great way to mock data for responses to routes"
+}

tests/cypress/support/commands.js

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+// ***********************************************
+// This example commands.js shows you how to
+// create various custom commands and overwrite
+// existing commands.
+//
+// For more comprehensive examples of custom
+// commands please read more here:
+// https://on.cypress.io/custom-commands
+// ***********************************************
+//
+//
+// -- This is a parent command --
+// Cypress.Commands.add('login', (email, password) => { ... })
+//
+//
+// -- This is a child command --
+// Cypress.Commands.add('drag', { prevSubject: 'element'}, (subject, options) => { ... })
+//
+//
+// -- This is a dual command --
+// Cypress.Commands.add('dismiss', { prevSubject: 'optional'}, (subject, options) => { ... })
+//
+//
+// -- This will overwrite an existing command --
+// Cypress.Commands.overwrite('visit', (originalFn, url, options) => { ... })

tests/cypress/support/e2e.js

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+// ***********************************************************
+// This example support/e2e.js is processed and
+// loaded automatically before your test files.
+//
+// This is a great place to put global configuration and
+// behavior that modifies Cypress.
+//
+// You can change the location of this file or turn off
+// automatically serving support files with the
+// 'supportFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/configuration
+// ***********************************************************
+
+// Import commands.js using ES2015 syntax:
+import './commands'
+
+// Alternatively you can use CommonJS syntax:
+// require('./commands')