Replace the site icon fallback with a gray logo image

[sabernhardt]

• Adds a new gray logo in wp-includes/images. (I started with wp-admin/images/wordpress-logo-gray.svg, added a white background, and used Adobe Illustrator to save as PNG.)
• Calls the new image in embed site title link and do_favicon() function.
• Removes custom properties from embed CSS because the variables would not be defined.

Current blue logo

Gray logo

Trac 64877

Use of AI Tools: none

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Props sabernhardt, huzaifaalmesbah, westonruter.

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[huzaifaalmesbah]

Looks good to me.

[westonruter]

Should we take this as an opportunity to use the SVG logo instead? This was added to wp-admin recently: https://github.com/WordPress/wordpress-develop/blob/1afbc8ae29e1be0d466182bc74a0c5261b60a70f/src/wp-admin/images/wordpress-logo-gray.svg

[sabernhardt]

That's the image I used to create the PNG 😉
though I added a white <circle> for the background:

<circle fill="#ffffff" cx="32" cy="32" r="32"/>

Adding the (modified) SVG in wp-includes/images works when calling it in the embed template.
<img src="http://localhost/dev/src/wp-includes/images/w-logo-gray-white-bg.svg" srcset="http://localhost/dev/src/wp-includes/images/w-logo-gray-white-bg.svg 2x" width="32" height="32" alt="" class="wp-embed-site-icon">

I'm not entirely convinced it should be SVG, but if not, my last commit can be reverted to keep the PNG there.