Bump nightwatch from 2.6.21 to 3.0.1 (#554)

* Bump nightwatch from 2.6.21 to 3.0.1

Bumps [nightwatch](https://github.com/nightwatchjs/nightwatch) from 2.6.21 to 3.0.1.
- [Release notes](https://github.com/nightwatchjs/nightwatch/releases)
- [Commits](nightwatchjs/nightwatch@v2.6.21...v3.0.1)

---
updated-dependencies:
- dependency-name: nightwatch
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Remove e2e setup and nightwatch

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: elisa lee <elisa@skylight.digital>

package.json

@@ -5,7 +5,6 @@
   "license": "CC0-1.0",
   "scripts": {
     "serve": "bundle exec jekyll serve --livereload --config _config.yml",
-    "serve:e2e": "bundle exec jekyll serve --livereload --config _config.yml,_e2e_config.yml",
     "setup": "npm run uswds-copy-assets && npm run uswds-build-sass",
     "build-webpack": "./node_modules/.bin/webpack",
     "uswds-build-sass": "gulp build-sass",
@@ -47,10 +46,7 @@
     "deploy-azure-demo": "./deploy.sh demo",
     "deploy-azure-stg": "./deploy.sh stg",
     "deploy-azure-prod": "./deploy.sh prod",
-    "docker:bundle:install": "docker run -ti -v $(pwd):/apps alpine/bundle:latest bundle install",
-    "e2e": "./e2e.sh default",
-    "e2e:chrome": "./e2e.sh chrome",
-    "e2e:brave": "./e2e.sh brave"
+    "docker:bundle:install": "docker run -ti -v $(pwd):/apps alpine/bundle:latest bundle install"
   },
   "dependencies": {
     "gulp-watch": "^5.0.1",
@@ -79,7 +75,6 @@
     "gulp-svg-sprite": "^1.5.0",
     "lodash": "^4.17.20",
     "minimist": "1.2.8",
-    "nightwatch": "^2.6.21",
     "postcss": "^8.4.23",
     "postcss-csso": "^5.0.1",
     "postcss-uncss": "^0.17.0",