Remove obsolete board svgs

minimill/motor-node/kicad/minimill-motor-node/minimill-motor-node-Edge_Cuts.svg

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- <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" 
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> 
-<svg xmlns="http://www.w3.org/2000/svg" version="1.1" 
-    width="3.10896cm" height="4.6482cm" viewBox="0 0 12240 18300 ">
-<title>SVG Picture created as minimill-motor-node-Edge_Cuts.svg date 2020/01/22 14:26:59 </title>
-  <desc>Picture generated by PCBNEW </desc>
-<g style="fill:#000000; fill-opacity:1;stroke:#000000; stroke-opacity:1;
-stroke-linecap:round; stroke-linejoin:round; "
- transform="translate(0 0) scale(1 1)">
-</g>
-<g style="fill:#000000; fill-opacity:0.0; 
-stroke:#000000; stroke-width:-0.000393701; stroke-opacity:1; 
-stroke-linecap:round; stroke-linejoin:round;">
-</g>
-<g style="fill:#000000; fill-opacity:0.0; 
-stroke:#000000; stroke-width:19.685; stroke-opacity:1; 
-stroke-linecap:round; stroke-linejoin:round;">
-<path d="M1791 2568
-L3641 2568
-" />
-<path d="M255 4104
-L1791 2568
-" />
-<path d="M255 12352
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-<path d="M10944 15738
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-<path d="M12086 14596
-L10944 15738
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-<path d="M12086 2568
-L12086 14596
-" />
-<path d="M3641 2568
-L12086 2568
-" />
-<g >
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-<g >
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-<g >
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-<g >
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-<g >
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-<g >
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-<g >
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-<g >
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-</svg>