add prelim website tests

cypress/support/index.d.ts

@@ -7,5 +7,10 @@ declare namespace Cypress {
      * @example cy.dataCy('greeting')
      */
     dataCy(value: string): Chainable<JQuery<HTMLElement>>;
+    /**
+     * Custom command to login user into the app.
+     * @example cy.login('admin', 'password)
+     */
+    login(username: string, password: string): Chainable<JQuery<HTMLElement>>;
   }
 }