Move CIF simulator SVG documentation partly to CIF language tutorial and reference manual
In the past, CIF/SVG mappings were only supported by the simulator. We now have the CIF code generator (for HTML) as well. Also, it is part of the language, and should thus be documented in the language tutorial (introduction and examples) and language reference manual (details).
The idea would be to move content, adapt the parts in the tutorial and reference manual to not have simulator-specific information, doing a proper separation. It is not a goal of this issue to improve the content itself.