Raspberry Pi mount for Ender 5 (pro) electronics enclosure

# ENDER 5 (pro) electronics mounting plate for Raspberry Pi

This mounting plate is designed to be placed inside the electronics case of an Creality Ender 5.
It should hook under the power switch on the left side of the case and has holes to be screwed onto the side of the Meanwell/Landy-PSU using M4 Screws.

It a direct remix but I changed the base plate to hold a [shelly](https://shelly.cloud/products/shelly-1-smart-home-automation-relay/) which can be powered directly from the printers 24V PSU.

Then I added a "one shot" service to the pi which depends on network and will be triggered on poweroff (shutdown, halt) and just sends an http get request to the shelly to trigger a delayed (10-20 seconds) relay power off. The pi can be powered off via octopi's main menu or gcode (`M118 //action:poweroff`) interpreted by the [octoprint plugin called "action commands"](https://plugins.octoprint.org/plugins/actioncommands/). This gcode can then be added to the end gcode segment by the