chore: remove canonical links from sitemap

Closes #849

astro.config.ts

@@ -20,6 +20,7 @@ import * as path from "path";
 import svgr from "vite-plugin-svgr";
 import { languages } from "./src/constants/index";
 import { fileToOpenGraphConverter } from "./src/utils/translations";
+import { posts } from "./src/utils/data";
 
 await symlink(path.resolve("content"), path.resolve("public/content"));
 
@@ -42,13 +43,17 @@ export default defineConfig({
 				}, {}),
 			},
 			filter(page) {
-				// return true, unless lart part of the URL ends with "_noindex"
+				// return true, unless last part of the URL ends with "_noindex"
 				// in which case it should not be in the sitemap
-				return !page
+				const lastPartOfSlug = page
 					.split("/")
 					.filter((part) => !!part.length)
-					.at(-1)
-					.endsWith("_noindex");
+					.at(-1);
+
+				if (lastPartOfSlug.endsWith("_noindex")) return false;
+				const relatedPost = posts.find((post) => post.slug === lastPartOfSlug);
+				if (relatedPost && relatedPost.originalLink) return false;
+				return true;
 			},
 			serialize({ url, ...rest }) {
 				return {