Fix pptx link

Author: DraTeots

docs/resources.md

@@ -2,5 +2,5 @@
 
 ## Documentation
 
-- [VTP Manual](/VTP-Manual_1.pdf)
-- [Previous Slides (2025-10-24)](/2025-10-24-figures.pptx)
+- <a href="/VTP-Manual_1.pdf" download>VTP Manual</a>
+- <a href="/2025-10-24-figures.pptx" download>Previous Slides (2025-10-24)</a>