Add XML namespace definition, fix wrong closing tag

feeds.ts

@@ -34,7 +34,7 @@ export async function profileAtomFeed(
 
   return `
     <?xml version="1.0" encoding="utf-8"?>
-    <feed xmlns="http://www.w3.org/2005/Atom">
+    <feed xmlns="http://www.w3.org/2005/Atom" xmlns:nostr="urn:nostr:protocol">
       <title>${profile.name} on Nostr (Articles)</title>
       <link rel="alternate" type="text/html" href="${profile.profileUrl}" />
       <link rel="alternate" type="application/nostr+json" href="nostr:${profile.npub}" />
@@ -44,7 +44,7 @@ export async function profileAtomFeed(
       <author>
         <name>${profile.name}</name>
         <uri>${profile.profileUrl}</uri>
-        <nostr:uri>nostr:${profile.nprofile}</nostr>
+        <nostr:uri>nostr:${profile.nprofile}</nostr:uri>
       </author>
       ${articlesXml}
     </feed>