add slides on open source contributor for GDG San Jose

Author: fharper

src/data/talks.json

@@ -13,7 +13,8 @@
         "name": "GDG San Jose",
         "url": "https://www.meetup.com/san-jose-technology-meetup-group/events/306833839/",
         "date": "2025-04-24",
-        "type": "talk"
+        "type": "talk",
+        "slides": "2025-04-24_-_GDG_San_Jose_-_How_to_become_an_open_source_contributor.pdf"
     },
     {
         "title": "Developers Documentation: your secret weapon",