✏️ Added inkscape specific notes

how_to_prep_svgs_inkscape.md

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+Taken from
+[StackExchange](https://graphicdesign.stackexchange.com/questions/147506/inkscape-to-convert-multiple-paths-into-one-single-path).
+
+1. Select everything, and do Ungroup Shift+Ctrl+G 5 times to remove all those
+   unnecessary nested groups.
+
+2. Do Path > Stroke to Path to turn the horizontal stroke into a path.
+
+3. Now you can do Path > Combine, or alternatively do Path > Union if you want
+   to get rid of any overlaps.
+
+4. Do File > Cleanup document
+
+5. To export as optimised SVG, do File > Save as, then select "Optimised SVG"
+   from the file type dropdown.
+
+6. In the Optimsed SVG Output dialog set up the items you want to keep and which
+   you want to remove. Here are my settings