adding CFP link to Summit 2025 page

adding CFP link to Summit 2025 page

Author: OliveCannon

content/en/events/isc-2025.md

@@ -15,4 +15,6 @@ To mark this exciting occasion, we’re bringing together our vibrant community
 
 Save the date and join us on November 13th in the city nearest you!
 
-More information on speakers, keynotes, and venues will be announced soon.
+More information on speakers, keynotes, and venues will be announced soon.
+
+**[Got a story to share? If you would like to speak at InnerSource Summit 2025 submit your talk idea here!](https://bit.ly/ISCSummit25CFP)**