Update Thompson speaker info with link to profile image.

Author: timathom

_data/speakers.yml

@@ -665,6 +665,7 @@
     library science and data science, he specializes in metadata creation, analysis, and
     transformation across various standards. Since 2016, he has focused on linked data
     standards and semantic modeling for cultural heritage materials."
+  image_src: "/assets/img/speakers/tim-thompson.jpg"
   image_alt: "Tim, a middle-aged white male with short, slightly graying hair and beard, flashes a
     friendly smile in black and white. Pictured from the shoulders up, he wears a spotted tie.
     Behind him is a blurred metal bookcase full of books."