remove generated files - leave only sources

any time FCStd sources are changed, the generated STL, STEP, DXF and
other derivatives are no longer current. it makes more sense to post and
tag the latter in releases.

README.md

@@ -8,6 +8,10 @@ be sufficient but you might want to install
 [fasteners workbench](https://wiki.freecadweb.org/Fasteners_Workbench) if working on
 a design assembly.
 
+there are currently version kinds available, DIY (FFF) and DIY+, and possibly
+third upcoming PRO. all versions have generated files like STL, STEP and DXF,
+attached to their respective releases on https://git.qcode.ch/nakamochi/3d/releases
+
 ## DIY version (FFF)
 
 fused filament fabrication design is suitable for 3D printing at home, located
@@ -23,11 +27,11 @@ the project contains all the parts to make a full assembly with the following BO
 - [joi-it armor "block" heatsink](https://joy-it.net/en/products/RB-AlucaseP4+07)
 - 90 degree angle [USB-C adapter][usbc90deg] 3.1 gen 2, 10Gbps
 - adhesive gasket/seal tape for LCD, 1mm thick, 10mm width, L370mm
+- 4 adhesive bottom pads
 - 4 screws M2.5 L16-18mm for heatsink mount
 - 4 spacers 2-4mm thick depending on the heatsink mount screws length
-- 4 adhesive bottom pads
-- [enclosure main box](fff/box.stl), 3D-printed
-- [enclosure side cup](fff/sidecup.stl), 3D-printed
+- 3D-printed enclosure main box (look for `box.stl` in releases)
+- 3D-printed enclosure side cup (look for `sidecup.stl` in releases)
 
 all object constraints reference an embedded spreadsheet `params` to avoid 
 [topological naming problem](https://wiki.freecadweb.org/Topological_naming_problem).
@@ -97,10 +101,10 @@ other parts, harvested from the above list:
 
 **custom parts**
 
-- [baseplate](diyplus/baseplate_techdraw_c.pdf), CNC milled from aluminium
-- [enclosure box](diyplus/box.stl), 3D-printed
-- [SSD support plate](diyplus/ssdsupport.stl), 3D-printed
-- 3 [spacers](diyplus/spacer_3x2.4mm.stl) Ø3mm hole, 2.4mm thick
+- CNC milled aluminium baseplate (look for `baseplate_techdraw_c.pdf` in releases)
+- 3D-printed enclosure box (look for `box.stl` in releases)
+- 3D-printed SSD support plate (look for `ssdsupport.stl` in releases)
+- 3 Ø3mm hole 2.4mm thick spacers (use `spacer_3x2.4mm.stl` for 3D-print)
 
 > TODO: assembly instructions