Swap order of steps in npm install example

[willheslam]

If node/install-packages comes first, the packages will already be installed
before the correct version of npm has been installed.

It'll look something a bit like this:

        environment:
          PARAM_CACHE_PATH: ''
          PARAM_OVERRIDE_COMMAND: npm install
        name: Installing NPM packages
        working_directory: .
    - save_cache:
        key: node-deps-{{ arch }}-v1-{{ .Branch }}-{{ checksum "/tmp/node-project-lockfile" }}
        paths:
        - ~/.npm
    - run:
        command: rm -f /tmp/node-project-lockfile /tmp/node-project-package.json /tmp/yarn-zero-lockfile
        name: Remove temporary links
    - run:
        command: sudo npm install -g npm@latest

whereas presumably we want something like this instead:

    - checkout
    - run:
        command: "# Only install nvm if it's not already installed\..."
        environment:
          NODE_PARAM_VERSION: '16.14'
        name: Install Node.js 16.14
    - run:
        command: sudo npm install -g npm@latest
    - run:
        command: |-
          # Fail if package.json does not exist in working directory

          if [ ! -f "package.json" ]; then

[Jaryt]

Makes sense to me. Thanks for submitting this change!

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