docs: Add GitHub icon

Author: manzt

docs/src/components/Header/Header.astro

@@ -24,6 +24,15 @@ const lang = getLanguageFromURL(currentPage);
 			</a>
 		</div>
 		<div style="flex-grow: 0.8;"></div>
+		<a
+			href="https://github.com/manzt/anywidget"
+			target="_blank"
+			aria-label="GitHub Repository"
+		>
+			<svg aria-hidden="true" viewBox="0 0 24 24" class="fill-gray-500 w-7 h-7">
+				<path d="M12.5.75C6.146.75 1 5.896 1 12.25c0 5.089 3.292 9.387 7.863 10.91.575.101.79-.244.79-.546 0-.273-.014-1.178-.014-2.142-2.889.532-3.636-.704-3.866-1.35-.13-.331-.69-1.352-1.18-1.625-.402-.216-.977-.748-.014-.762.906-.014 1.553.834 1.769 1.179 1.035 1.74 2.688 1.25 3.349.948.1-.747.402-1.25.733-1.538-2.559-.287-5.232-1.279-5.232-5.678 0-1.25.445-2.285 1.178-3.09-.115-.288-.517-1.467.115-3.048 0 0 .963-.302 3.163 1.179.92-.259 1.897-.388 2.875-.388.977 0 1.955.13 2.875.388 2.2-1.495 3.162-1.179 3.162-1.179.633 1.581.23 2.76.115 3.048.733.805 1.179 1.825 1.179 3.09 0 4.413-2.688 5.39-5.247 5.678.417.36.776 1.05.776 2.128 0 1.538-.014 2.774-.014 3.162 0 .302.216.662.79.547C20.709 21.637 24 17.324 24 12.25 24 5.896 18.854.75 12.5.75Z"></path>
+			</svg>
+		</a>
 		<ThemeToggleButton client:visible />
 		{
 			KNOWN_LANGUAGE_CODES.length > 1 && (