#357 Update CIF documentation for recent Inkscape versions

Closes #357 (closed).

This merge request includes

• Screenshots of the updated Inkscape interface.
• Text removed on the different coordinate systems, as there is no longer a difference (since Inkscape version >= 1.0).
• Text removed on resizing document, since Inkscape no longer adds a transformation to the first layer (at least in the latest Inkscape version 1.2.1 I used today).
• Updated menu names in text.
• Updated the SVG files used for the screenshot so they no longer generate a legacy warning on opening in Inkscape. (At some point Inkscape changed from 90 DPI to 96 DPI.)