fix: use permanent URLs to idetify feed items

feed.xml

@@ -10,42 +10,42 @@
   <entry>
     <title>About this web page</title>
     <link href="https://dadada.li/blog/about"/>
-    <id>urn:uuid:0f4e27c5-bef2-4691-b8a8-2cbc0f593c8f</id>
+    <id>https://dadada.li/blog/about/</id>
     <updated>2024-04-28</updated>
     <summary>About this web page</summary>
   </entry>
   <entry>
     <title>NixOS for Lazy Admins</title>
     <link href="https://gitli.stratum0.org/dadada/lazy-admin-talk"/>
-    <id>urn:uuid:0879def1-bd89-4fa0-97fc-58541378c714</id>
+    <id>https://gitli.stratum0.org/dadada/lazy-admin-talk</id>
     <updated>2023-09-14</updated>
     <summary><a href="https://bbb.stratum0.org/playback/presentation/2.3/b3f9875e5e8180697cd3d3029085a7ef441d513d-1694710080145">Recording</a></summary>
   </entry>
   <entry>
     <title>Gitlab als Archivar</title>
     <link href="https://dadada.li/talks/pad-archiver"/>
-    <id>urn:uuid:0eca066e-922e-4df7-a495-bff5a78448ef</id>
+    <id>https://dadada.li/talks/pad-archiver</id>
     <updated>2022-06-14</updated>
     <summary>Gitlab als Archivar</summary>
   </entry>
   <entry>
     <title>systemd-generator(7)</title>
     <link href="https://dadada.li/talks/systemd-generator"/>
-    <id>urn:uuid:d4ec7148-747e-4724-9d83-d565b96f28e5</id>
+    <id>https://dadada.li/talks/systemd-generator</id>
     <updated>2019-03-14</updated>
     <summary>systemd-generator(7)</summary>
   </entry>
   <entry>
     <title>My $HOME</title>
     <link href="https://dadada.li/blog/home-layout"/>
-    <id>urn:uuid:ffe1d09a-87aa-448a-a80c-efa175430bbf</id>
+    <id>https://dadada.li/blog/home-layout</id>
     <updated>2018-09-03</updated>
     <summary>My $HOME</summary>
   </entry>
   <entry>
     <title>Managing Striped GPG Keys</title>
     <link href="https://dadada.li/blog/gpg"/>
-    <id>urn:uuid:ff6cbe87-67f8-415f-9ed5-6ec2a99a51a3</id>
+    <id>https://dadada.li/blog/gpg</id>
     <updated>2017-12-03</updated>
     <summary>Managing Striped GPG Keys</summary>
   </entry>