Change: Add missing apt-get install line to README.md

[cfi-gb]

What

If the nodejs package isn't installed it can't be used later.

Note: https://deb.nodesource.com/ is using different install instructions, we might want to adjust it completely to that:

~$ sudo apt-get update && sudo apt-get install -y ca-certificates curl gnupg
~$ curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | sudo gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
~$ NODE_MAJOR=20
~$ echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_$NODE_MAJOR.x nodistro main" | sudo tee /etc/apt/sources.list.d/nodesource.list
~$ sudo apt-get update && sudo apt-get install nodejs -y

Why

Better documentation

References

None

[github-actions]

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