Update presentations: remove Google Slides requirement, add .ppsx tip

Author: ank-agar

index.html

@@ -1418,9 +1418,9 @@ <h1>13. Presentations</h1>
 
   <h2 id="s13-1">13.1 Format &amp; Storage</h2>
   <ul>
-    <li>All presentations should be prepared as <strong>Google Slides</strong>.</li>
     <li>Decks must be pushed to the dedicated folder in the shared lab drive.</li>
     <li>Project updates and results should be included for transparency.</li>
+    <li><strong>Always save a copy as a PowerPoint Show (.ppsx).</strong> A .ppsx file opens directly into slideshow mode and runs on any device &mdash; even without PowerPoint installed. This is the safest format for presenting on unfamiliar computers at conferences, hospital settings, or collaborator meetings where you can't guarantee what software is available.</li>
   </ul>
 
   <h2 id="s13-2">13.2 Slide Design Principles</h2>