DOC: Add a tutorial for the edit mode

CHANGELOG.md

src/doc/tutorials/change-entity.png

src/doc/tutorials/delete-entity-button.png

src/doc/tutorials/edit-entity-button.png

src/doc/tutorials/edit-mode-button.png

src/doc/tutorials/edit-mode-toolbox.png

src/doc/tutorials/edit_mode.rst

src/doc/tutorials/file-upload.png

src/doc/tutorials/index.rst

src/doc/tutorials/new-property.png

src/doc/tutorials/new-record.png

src/doc/tutorials/new-recordtype.png