docs: `usage` page in `guides`

[xDivisionByZerox]

trafficstars

This PR moves the usage section from 'Getting started' in it's own page.

[codecov[bot]]

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[Shinigami92]

Nicely made, reads really fluent like a good tutorial blog post 👍 Would like to ship this soon

[xDivisionByZerox]

Nicely made, reads really fluent like a good tutorial blog post 👍 Would like to ship this soon

Thank you, this is really appreciated. Always discussing with myself if I should do stuff like a blog, but imposter syndrome is way to strong.