README.md: Testing instructions are broken

[martinfrances107]

There is a error hidden in the README.md

looking at the "testing" subheading

the container name is incorrect throughout the command line instructions.

looking at a recent test run

https://circleci.com/gh/jsdrupal/drupal-admin-ui/9267?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link

under the run-test pull down option

#!/bin/bash -eo pipefail
docker exec -it drupal_admin_ui_drupal drush user:password admin admin
REACT_APP_DRUPAL_BASE_URL=http://drupal NIGHTWATCH_LOGIN_admin_PASSWORD=admin yarn test
^@^@ [success] Changed password for admin.
yarn run v1.16.0
$ yarn run test:lint && yarn workspace @drupal/admin-ui test
$ eslint packages/*/src  --ext .js,.jsx,.ts,.tsx --max-warnings=0 --format junit -o reports/eslint-junit.xml

The build scripts correctly identify the container as

drupal_admin_ui_drupal

whereas the README.md uses

drupal_admin_ui_node

[martinfrances107]

The instructions have been revised -- and are in a excellent state of readability.