Minor tweaks on pages
- Add source SVGs for Moving and Rotating Letters.
- Added 10px around text in PNGs in Moving and Rotating Letters.
- Put "or" instead of comma in shortcut lists of Grouping Objects.
- Larger dialogue on Interpolate extention.
- Optimize source SVG of Interpolate extension image.
Images created with Inkscape 1.1.2. Files have been optimised for size. Part of #48 (closed)