feat: add local flag SVGs for language switcher

public/flags/en.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1235" height="650" viewBox="0 0 7410 3900"><path fill="#b31942" d="M0 0h7410v3900H0"/><path stroke="#FFF" stroke-width="300" d="M0 450h7410m0 600H0m0 600h7410m0 600H0m0 600h7410m0 600H0"/><path fill="#0a3161" d="M0 0h2964v2100H0"/><g fill="#FFF"><g id="d"><g id="c"><g id="e"><g id="b"><path id="a" d="m247 90 70.534 217.082-184.66-134.164h228.253L176.466 307.082z"/><use xlink:href="#a" y="420"/><use xlink:href="#a" y="840"/><use xlink:href="#a" y="1260"/></g><use xlink:href="#a" y="1680"/></g><use xlink:href="#b" x="247" y="210"/></g><use xlink:href="#c" x="494"/></g><use xlink:href="#d" x="988"/><use xlink:href="#c" x="1976"/><use xlink:href="#e" x="2470"/></g></svg>

public/flags/fr.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="900" height="600"><path fill="#CE1126" d="M0 0h900v600H0"/><path fill="#fff" d="M0 0h600v600H0"/><path fill="#002654" d="M0 0h300v600H0"/></svg>

public/flags/it.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="1500" height="1000" viewBox="0 0 3 2"><path fill="#009246" d="M0 0h3v2H0z"/><path fill="#fff" d="M1 0h2v2H1z"/><path fill="#ce2b37" d="M2 0h1v2H2z"/></svg>