style(index): switch to shadcn/ui zinc theme

public/icons/z0x.svg

@@ -38,7 +38,7 @@
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-     style="display:inline;fill:#e5e7eb;fill-opacity:1;stroke:none;stroke-width:1.18365;stroke-opacity:1"
+     style="display:inline;fill:#f8f8f8;fill-opacity:1;stroke:none;stroke-width:1.18365;stroke-opacity:1"
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