Point library references at the new Gitea home

kicad-visaton-lib moved to
ssh://git@src.bundespruefstelle.ch:2022/magdev/kicad-visaton-lib.git.

Also corrects the image source label, which named a repository that does not
exist: this repo is magdev/boxsim-fileformat-rev, not boxdev/re-boxsim.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -2,7 +2,7 @@
 
 Read Boxsim loudspeaker projects and turn their crossovers into KiCad projects.
 
-[Boxsim](https://www.visaton.de/) is Visaton's free loudspeaker simulation program. Its project files (`.bpj`) and driver files (`.bch`) use an undocumented container, reverse engineered here. `boxsim` decodes them and generates a KiCad 10 project whose schematic mirrors the crossover you drew in Boxsim, with every part bound to a symbol and footprint from [kicad-visaton-lib](https://src.bundespruefstelle.ch/boxdev/kicad-visaton-lib).
+[Boxsim](https://www.visaton.de/) is Visaton's free loudspeaker simulation program. Its project files (`.bpj`) and driver files (`.bch`) use an undocumented container, reverse engineered here. `boxsim` decodes them and generates a KiCad 10 project whose schematic mirrors the crossover you drew in Boxsim, with every part bound to a symbol and footprint from [kicad-visaton-lib](https://src.bundespruefstelle.ch/magdev/kicad-visaton-lib).
 
 ## Install
 
@@ -15,6 +15,7 @@ Nothing is required at runtime beyond Python 3.11+. KiCad 10 is a hard dependenc
 Point the tool at the Visaton library and the Boxsim parts catalogue:
 
 ```bash
+git clone ssh://git@src.bundespruefstelle.ch:2022/magdev/kicad-visaton-lib.git
 export BOXSIM_KICAD_LIB=/path/to/kicad-visaton-lib
 export BOXSIM_CATALOG="/path/to/BoxSim 2.1 DE/Weichenbauteile/Visatonteile.txt"
 ```