Adjust dpsim docs for cases with InterfaceVillas

[SystemsPurge]

Following this example:
https://dpsim.fein-aachen.org/docs/tasks/create-simulation/
The cmakelists file should also have dpsim-villas, villas-common and jansson next to dpsim in the target link libraries, for scenarios that use InterfaceVillas otherwise it does not work. This is because , i take it, not all dpsim simulations are going to reference the InterfaceVillas so they are not automatically linked, although it could be adjusted with some option/flag.
It might be a bug because cmake does manage to find libvillas, although the variable for the villas libraries in the cmakelists is expecting multiple libraries. It does not make sens for it to link villas automatically but villas-common only sometimes

TO REPRODUCE:
Run https://dpsim.fein-aachen.org/docs/tasks/create-simulation/ with a scenario that contains interfacevillas/interfaceworkervillas code.

[pipeacosta]

I can help 😊