Update copyright text

Author: nghtctrl

src/pages/copyright.astro

@@ -20,15 +20,6 @@ const metadata = {
   </p>
   <h2>Attributions</h2>
   <ul>
-    <li>
-      My <Link
-        href='https://github.com/nghtctrl/nghtctrl.github.io/blob/cd912915114bfbee4fc938c9a365d505834ee545/src/assets/profile-picture.webp'
-        isExternal>profile picture</Link
-      > is a portrait based on my <Link
-        href='https://github.com/nghtctrl/nghtctrl.github.io/blob/cd912915114bfbee4fc938c9a365d505834ee545/src/assets/profile-picture-alternative.webp'
-        isExternal>selfie</Link
-      >, illustrated by Koré Qualls, 2023.
-    </li>
     <li>
       Papers embedded in this website are licensed by their respective
       publishers (e.g., ACM, IEEE) or repositories that provide open access