Better to add system requirements in docs

[adamant-al]

When installing zenbot on Ubuntu 16/18 VPS with 1GB RAM, it fails on installing dependencies.

cd zenbot
npm install

Worst thing is you can miss warnings/errors, and zenbot will work then, but some components like dashboard will look bad, or don't work. And it is hard to make sure what is the reason.

Better to add system requirements in docs with 2GB RAM recommendation.

[stale]

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