migrate from XLSForm

[PeterPetrik]

XLSForm are used as field survey form spec on various competitors . We should add sections migrate from and mention those competitors. To convert from XLSForm to QGIS there are various plugins that can be used, or can be manually rewritten - e.g. "XLSForm Converter"

[PeterPetrik]

@alex-cit we can point the docs to this repo from @geobabbler , see https://blog.geomusings.com/2026/02/17/xlsform-with-mergin-maps/

also see https://docs.qfield.org/how-to/advanced-how-tos/xlsforms-plugin/