Remove marine biology demo game project details

Removed the Awesome Demo Game Project section focused on marine biology from the 2026 GSoC page.

Author: wslany

pages/development/google-summer-of-code/2026.md

@@ -104,22 +104,6 @@ You won’t need to implement everything—just focus on the part that excites y
 
 <hr>
 
-### Awesome Demo Game Project on Marine Biology
-350 Hours  
-{: .label .label-blue }
-
-{: .highlight  }
-> **Required Skills**: Coding Basics<br>
-> **Possible Mentors**: Selina Ernst, Wolfgang Slany <br>
-> **Expected Outcome**: Catrobat Demo Game on Marine Biology <br>
-> **Difficulty level**: Beginner 
-
-Spend the whole GSoC time developing and designing a demo game. This year's focus of Catrobat includes topics around marine biology as an application area, and we have several projects around the general topic. The present project aims at inspiring young people to become aware of topics related to the protection of marine habits by creating related video games of their own. If you have your own original idea about a game around this topic, please feel free to suggest it. Please note that the demo game will be published under Catrobat’s free open source license, and that the game will thus become part of the Catrobat FLOSS project’s source code. Thus, all artwork, sounds, character names etc must be compatible with our licenses, i.e., freely publishable under our licenses, the AGPL version 3 and CC BY-SA 4.0, or under a compatible, possibly even freer license such as CC0.
-
-<hr>
-
----
-
 ### Skeleton-Based Procedural Animation System for Marine Organisms
 
 350 Hours