User Guide: 'Importing an mbed program' is out-of-date
Further details: http://www.openstm32.org/forumthread5355
Related content
Development tools for Zephyr on STM32
Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.
Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.