remove nightwatch and obsolete e2e tests

test/e2e/specs/test.js

@@ -1,19 +0,0 @@
-// For authoring Nightwatch tests, see
-// http://nightwatchjs.org/guide#usage
-
-module.exports = {
-  'default e2e tests': function (browser) {
-    // automatically uses dev Server port from /config.index.js
-    // default: http://localhost:8099
-    // see nightwatch.conf.js
-    const devServer = browser.globals.devServerURL
-
-    browser
-      .url(devServer)
-      .waitForElementVisible('#app', 5000)
-      .assert.elementPresent('.hello')
-      .assert.containsText('h1', 'Welcome to Your Vue.js App')
-      .assert.elementCount('img', 1)
-      .end()
-  },
-}