fix: browser double-fetches PNG and SVG favicons

[vivek7405]

Problem

When visiting webjs apps (website, docs, blog example, etc.), browsers fetch both favicon.svg and favicon.png because both are declared with rel="icon" without sizes/type specifications that allow the browser to distinguish them.

Solution

Add sizes="any" to the PNG favicon link so that modern browsers can immediately prioritize the SVG version without double-fetching both.