Where can I get the latest stable image to flash to sdcard for turris mox?

Suppose I want to start from scratch and flash the sdcard with the latest stable turris os for the turris mox, which image should I be downloading and from where?

https://docs.turris.cz/hw/mox/rescue-modes/#re-flash-router

What does medkit refer to?

The name of the folder where the latest version of the system image file is located … what else ?