fix(gcc2026): rename Keynote.jpg to avoid case collision

Two distinct images were tracked at paths differing only in case:
Keynote.jpg (news recap) and keynote.jpg (event page tile). On
case-insensitive filesystems (macOS, Windows) only one can exist in
the working tree, so checkouts silently lose one image and report a
permanent spurious modification.

Rename the news recap image to keynote-recap.jpg and update its
reference. The event page image keeps its original path, so no
published URL for it changes.

Author: itisAliRH

content/images/events/gcc2026/Keynote.jpg …/images/events/gcc2026/keynote-recap.jpgcontent/images/events/gcc2026/Keynote.jpg renamed to content/images/events/gcc2026/keynote-recap.jpg content/images/events/gcc2026/Keynote.jpg renamed to content/images/events/gcc2026/keynote-recap.jpg

@@ -72,7 +72,7 @@ The talk focused on the challenge of working with massive public sequencing data
 The keynote was a powerful example of the kind of ambitious, data-intensive science that Galaxy helps make more accessible, reproducible, and collaborative.
 
 <figure style="margin: 1.5rem 0;">
-  <img src="/images/events/gcc2026/Keynote.jpg" alt="Rayan Chikhi presenting the GCC2026 keynote." style="width: 100%; border-radius: 12px;" />
+  <img src="/images/events/gcc2026/keynote-recap.jpg" alt="Rayan Chikhi presenting the GCC2026 keynote." style="width: 100%; border-radius: 12px;" />
 </figure>
 
 ## Posters, Demos, and Lightning Talks