✨ feat(header): add toolbar component

This commit adds a new `HeaderToolbar` component to the `app/page.tsx` file. The toolbar includes links to the English and Russian versions of the blog. This change improves the user experience by providing easy access to the different language versions of the blog.

public/file.svg

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public/globe.svg

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public/next.svg

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public/vercel.svg

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public/window.svg

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