Add GSoC March 13th notice

Author: valencik

src/blog/gsoc-2026.md

@@ -6,6 +6,11 @@
 
 # Typelevel Summer of Code 2026
 
+@:style(bulma-notification)
+  Due to overwhelming participation we have decided only to consider applicants who have completed our [onboarding](https://github.com/typelevel/gsoc-onboarding) before [Friday March 13th anywhere on earth](https://time.is/Anywhere_on_Earth).
+  If you can't make this deadline, we encourage you to participate next year.
+@:@
+
 We are pleased to announce that Typelevel is a Mentoring Organization for [Google Summer of Code 2026][GSoC]! If you are a student, this is a wonderful opportunity to spend your summer working on Scala open source projects with mentorship from Typelevel maintainers, while earning a stipend. You can learn more about what the experience is like in [this blog post][feral-blog] by our 2024 contributor Ching Hian Chew.
 
 Please check out [our project ideas and mentors][ideas] spanning serverless, build tooling, frontend/UIs, systems programming, web assembly, and more. Furthermore, if you have an idea of your own, we would love to hear it: Typelevel members have a wide range of interests and a special fondness for building “at the cutting edge of some incredibly bizarre stuff.”

src/gsoc/README.md

@@ -10,6 +10,12 @@ We work together to develop projects that apply functional programming to challe
 Our community culture embraces curiosity and mentoring and we don’t shy away from experimenting with new and exciting ideas.
 Most of all, we love to make programming joyful and social.
 
+@:style(bulma-notification)
+  Due to overwhelming participation we have decided only to consider applicants who have completed our [onboarding](https://github.com/typelevel/gsoc-onboarding) before [Friday March 13th anywhere on earth](https://time.is/Anywhere_on_Earth).
+  If you can't make this deadline, we encourage you to participate next year.
+@:@
+
+
 ## Getting Started
 
 We are excited to be a Mentoring Organization in [Google Summer of Code 2026][GSoC]! If you are interested to join Typelevel as a GSoC Contributor, here are some ways to get started: