refactor: replace icons with svg components, relocate icons and images, rename directories

src/assets/icons/copy-action.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+  <path d="M7.2 1h14.4v17.7l-1.3.5V2.5H6.7z M2.3 4.9h15.4V23H2.3zm14.1 1.5H3.6v15.1h12.8z"/>
+</svg>

src/assets/icons/copy-check.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+  <path d="M9 20 .9 11.9l1.2-.6L9 17.6 22.5 5l.6 1z"/>
+</svg>

src/assets/icons/go-back.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+  <path d="M17.9.6 4 12l13.8 11.4.7-.9L7.2 12 18.5 1.5l-.7-.9Z"/>
+</svg>

src/assets/icons/language-switcher.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+  <path d="M19.1 21 12.4 2h-1.2L4.6 21l-2.5.2v.8h6.3v-.8L5.6 21l2-5.9h7.5l2 5.9-3.3.2v.8h8.1v-.8zM7.9 14.3l3.4-10.1 3.5 10.1z"/>
+</svg>

src/assets/icons/pin-icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+  <path d="M16.5 23.6c.6-6.1 1.1-8.6 7.2-15.5L15.9.4C9 6.5 6.5 7 .4 7.5l7.4 7.4-6.4 7 .7.7 7-6.4zm-.8-21.3 6 6c-5 6.1-5.7 8.1-6.2 12.2L3.4 8.5C7.5 8 9.5 7.3 15.6 2.3Z"/>
+</svg>

src/assets/icons/theme-toggle.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+  <path d="M12 1C5.9 1 1 5.9 1 12s4.9 11 11 11 11-4.9 11-11S18.1 1 12 1m0 20c-5.8 0-10.5-4-10.5-9S6.2 3 12 3s10.5 4 10.5 9-4.7 9-10.5 9"/>
+</svg>

src/assets/icons/toc-icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+  <path d="M22.2 2.3H1.8v1.6h19.8zM1.8 21.7h19.8l.6-1.6H1.8zM15.5 11.2H1.8v1.6h13.1z"/>
+</svg>