Improve open-source callout

content/_sec_intro.qmd

@@ -7,7 +7,11 @@ The course makes heavy use of circuit simulation, using **Xschem** for schematic
 Tools and PDK are integrated in the **IIC-OSIC-TOOLS** Docker image, which will be used during the coursework.
 
 ::: {.callout-important}
-All course material is made publicly available on GitHub and shared under the Apache-2.0 license.
+All course material (source code of this document, Jupyter notebooks for calculations, Xschem circuits, etc.) is made publicly available on GitHub ([follow this link](https://github.com/iic-jku/analog-circuit-design)) and shared under the Apache-2.0 license.
+
+Please feel free to submit pull requests on GitHub to fix errors and omissions!
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+The production of this document would be impossible without these (and many more) great open-source software products: `VS Code`, `Quarto`, `Pandoc`, `TexLive`, `Jupyter Notebook`, `Python`, `Xschem`, `ngspice`, `CACE`, `pygmid`, `schemdraw`, `Numpy`, `Scipy`, `Matplotlib`, `Pandas`, `Git`, `Docker`, `Ubuntu`, `Linux`, ...
 :::
 
 ## IHP's SG13G2 130nm CMOS Technology