reorganize doc

docs/available-features/available-features.md

docs/available-features/images/index/accrochage.gif

docs/available-features/images/index/bo_studio.jpg

docs/available-features/images/index/comparaison.gif

...ble-features/images/index/getfeatureinfo_admin_couche.jpg

...ble-features/images/index/getfeatureinfo_mode_carto-2.jpg

docs/available-features/images/index/maintenance_page.jpg

docs/available-features/images/index/mobile_cadastre.png

docs/available-features/images/index/mobile_measure.png

docs/available-features/images/index/mobile_saisie.png

docs/available-features/images/index/mode_carto-1.png

docs/available-features/images/index/vMap_Docker.png

docs/index.md

docs/presentation/images/12.png

docs/presentation/images/13.png

docs/presentation/images/14.gif

docs/presentation/images/bo_accrochage.gif

docs/presentation/images/bo_forms.gif

docs/presentation/images/bo_studio.gif

docs/presentation/images/carto_services.gif