Add utteranc.es comments

Author: sh4ka

src/layouts/BlogPost.astro

@@ -80,6 +80,14 @@ const { title, description, pubDate, updatedDate, heroImage } = Astro.props;
 				</div>
 			</article>
 		</main>
+		<script src="https://utteranc.es/client.js"
+                repo="sh4ka/rustquant"
+                issue-term="url"
+                label="blog-comment"
+                theme="github-light"
+                crossorigin="anonymous"
+                async>
+        </script>
 		<Footer />
 	</body>
 </html>