Documentation for custom poi_types.xml

[DFyson]

Looking at the technical documentation, I cannot find mention of making a custom poi_types.xml and where to put it. I managed to find the answer (put in folder named 'settings') but would be nice to have it easier to find just like making a custom rendering.

[hvdwolf]

Currently reviewing some of the help pages (also did a pull request). If I have time I will add it to the technical articles.

[vshcherb]

Cool @hvdwolf 👍