Update cheatsheets

openscad

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# openscad
+
+> Software for creating solid 3D CAD objects.
+> More information: <https://openscad.org>.
+
+- Open a file:
+
+`openscad {{path/to/button.scad}}`
+
+- Convert a file to STL:
+
+`openscad -o {{path/to/button.stl}} {{path/to/button.scad}}`
+
+- Render a file to PNG in a specific colorscheme:
+
+`openscad -o {{path/to/button.png}} --colorscheme {{Sunset}} {{path/to/button.scad}}`