Add example requests

[wegewerk-mkb]

Is your feature request related to a problem? Please describe.
The documentation does not give an example on how to request pages/content. After installing the extension and adding a site config, I can go to /headless and get a JSON representation of that page. How would I get any other page? What arguments are supported? To need to POST or GET?

Describe the solution you'd like
A short list of example URLs or curl requests would be great to understand what's possible

[tmotyl]

whith headless you navigate through pages using slugs (urls same as in non-headless mode) not page ids

[wegewerk-mkb]

I was under the impression that the headless API would be in addition to the normal site rendering. This seems to be an either-or situation. I can't output an already existing page tree as JSON trough this extension - correct?

[tmotyl]

yes, you can have both rendering types allowed for the same page (or have just one of them enabled)