Update images on The Shape Tools

Bernd Kamperequested to merge
kaleru/manuals:shape-tools-1.1 into master

Vector graphics have been redrawn. Source SVGs are included. Images show the control points of the shapes. All rst images are now figures (screenshots).

Images created with Inkscape 1.1.2. Files have been optimised for size. Part of #16 and #48 (closed)

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