Add UTM attribute (is this how UTM attributes work?)

_layouts/default.html

@@ -27,7 +27,7 @@
     </main>
     <footer>
         copyright 2025 Brendan Chen |
-        <a target="_blank" href="https://bchendev.substack.com">Substack</a> |
+        <a target="_blank" href="https://bchendev.substack.com?utm_source=bchen.dev">Substack</a> |
         <a target="_blank" href="https://github.com/brendan-ch">GitHub</a> |
         <a target="_blank" href="https://linkedin.com/in/brendan-ch">LinkedIn</a> | e: me [at] bchen.dev
     </footer>

index.md

@@ -8,6 +8,8 @@ isIndexPage: 1
 
 **I'm Brendan, a recently graduated Software Engineering student at [Chapman University](https://chapman.edu/).** I was previously a digital technology intern at [Cargill](https://cargill.com), working in the Branded Feed business to create new digital experiences. I'm the creator of [Interchange](https://interchange.bchen.dev), a free app to streamline the Chapman transit experience.
 
+I recently started publishing on Substack, [where I wrote about how I experienced LLMs as a student](https://bchendev.substack.com/p/reflections-on-llms-as-a-student?utm_source=bchen.dev).
+
 I'm simply interested in creating with software, experimenting with ideas, and learning from others. I view programming and engineering as creative outlets where I can apply my technical expertise to solve traditionally hard problems.
 
 I'm on [Substack](https://bchendev.substack.com), [GitHub](https://github.com/brendan-ch), and [LinkedIn](https://linkedin.com/in/brendan-ch). You may also [email me](mailto:me@bchen.dev).

notes.html

@@ -5,7 +5,7 @@ layout: default
 
 <h1>Notes</h1>
 
-<p>I've moved publishing to my [Substack](https://bchendev.substack.com). For reference, old notes remain accessible here.</p>
+<p>I've moved publishing to my [Substack](https://bchendev.substack.com?utm_source=bchen.dev). For reference, old notes remain accessible here.</p>
 
 <p></p>