Update RSS elements and TOC svg

src/pages/rss.xml.js

@@ -6,12 +6,24 @@ const parser = new MarkdownIt();
 
 export const GET = async (context) => {
   const blog = await getCollection("blog");
+
+  const latestModDate = blog.reduce((latest, article) => {
+    const modDate = article.data.modDate || article.data.pubDate;
+    return modDate > latest ? modDate : latest;
+  }, new Date(0));
+
   return rss({
-    title: "Thilo Hohlt’s Blog",
-    description: "Thilo Hohlt’s Blog",
+    title: "Thilo Hohlt's Blog",
+    description: "Thilo Hohlt's Blog",
     site: context.site,
     trailingSlash: false,
-    stylesheet: "pretty-feed-v3.xsl",
+    xmlns: {
+      atom: "http://www.w3.org/2005/Atom",
+    },
+    customData: `
+      <lastBuildDate>${latestModDate.toUTCString()}</lastBuildDate>
+      <atom:link href="${context.site}rss.xml" rel="self" type="application/rss+xml" />
+    `,
     items: blog.map((article) => ({
       link: `/blog/${article.id}/`,
       content: sanitizeHtml(parser.render(article.body), {