Install node 16+ on the server

[ob-ivan]

So far I've been using node via nvm.

However, this does not automatically apply to cron scripts: they use the system node version, which is 8, and npm is version 2. This results in a need of an ugly incantation for the deployment script to work.

[ob-ivan]

• curl -fsSL https://rpm.nodesource.com/setup_16.x | sudo bash -
• sudo yum install -y nodejs

Package 2:nodejs-8.17.0-1nodesource.x86_64 already installed and latest version

[ob-ivan]

This might be better solved by #62.