update logo to just use paths in svg

doc/mimalloc-logo.svg

@@ -36,15 +36,15 @@
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      inkscape:document-units="mm"
      inkscape:current-layer="layer1"
      showgrid="false"
      inkscape:window-width="3840"
-     inkscape:window-height="2160"
+     inkscape:window-height="2050"
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+     inkscape:window-x="-12"
-     inkscape:window-y="0"
+     inkscape:window-y="-12"
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      inkscape:snap-object-midpoints="false"
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@@ -126,17 +126,15 @@
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          id="path6525" />
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