M.2 SSD Organizer (stackable)

Added M.2 variables to Boubobo's SCAD file and STLs. Added comments explaining what the variables do and stuff. Kept tolerances equal between object types, and fixed SODIMM measurements.

Should fit single or double sided M.2 SSDs - SATA or NVMe are the same form factor, so those shouldn't matter either.

The sides of the print can warp, since the hexagons cut into it. I'm not good enough at OpenSCAD to fix that though.

If I were going to print it again, I would probably decrease the thickness of the slots (change the "m2y" variable in OpenSCAD). It's currently 2.4, I'd probably change it to 2.