Add end-to-end test for index file hosting

Author: rgladwell

cypress/integration/routing/index-file.spec.js

@@ -0,0 +1,9 @@
+context('routing.indexFile', () => {
+  it('handles index file routing', () => {
+    cy.visit('http://localhost:3000/index.html');
+
+    cy.get('.sidebar-nav').contains('Changelog').click();
+
+    cy.get('#main').should('contain', 'Bug Fixes');
+  })
+});