docs: Move SVGO preset JSON file to the public/ directory

This reverts commit 8e1ca4b.

In theory, we should be able to put this file in the public/ directory
and link it using an absolute path like /SVG-foo.json , but that doesn't
work when a docroot is used. This is a bug in VitePress, which I've
filed as vuejs/vitepress#1806

In the meantime, using a relative path works around this issue.

Change-Id: I86367455eea49766090c5cdfe74f8da6b2514731

Author: catrope

packages/codex-docs/docs/contributing/designing-icons.md

@@ -146,7 +146,7 @@ Export the optimized version of the icon with help from Figma’s [SVG Export pl
 
 <div class="cdx-docs-col cdx-docs-col-start cdx-docs-col-m">
 
-1. Find the SVG Export plugin using the “Plugins” section in Figma’s main menu and run it. Before exporting the icon, please import the [preset “WikimediaUI” (download link for JSON file)](./SVG-export-Wikimedia-SVGO-preset.json). The import option is available from a menu in the “Presets” panel.
+1. Find the SVG Export plugin using the “Plugins” section in Figma’s main menu and run it. Before exporting the icon, please import the [preset “WikimediaUI” (download link for JSON file)](../SVG-export-Wikimedia-SVGO-preset.json). The import option is available from a menu in the “Presets” panel.
 
 2. Apply the WikimediaUI SVGO presets to the icon to be exported, then proceed to export the icon using the “Export all” button
 </div>