Add APG to documentation

[anwai98]

This PR aims to add APG to the docs, wherever relevant. I'll work on finding relevant things associated to the APG feature and puzzle it together.

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[anwai98]

Hi @constantinpape,

This is good for review! (I am still pending on running the Jupyter Notebook from my side - to have the example segmentations out of it), but now we basically add APG to example scripts! (and add it's mentions in the CLI script, add a new section, and mention that it's directly compatible with the python interface and CLI) -> can be tried by anyone just by controlling the segmentation_mode.

Let me know how it looks!

[constantinpape]

The changes look good, see minor comments, but we should still add a dedicated section in the docs, to have a reference we can easily link to. It doesn't have to contain much info, but at least collect the references for where to find more information and how to use the tool.

[constantinpape]

I took care of the points I remarked, will merge it once the tests pass.

[anwai98]

Thanks @constantinpape 🥳