shoehorn some missing orgs and projects into this PR

Author: vvolkl

_gsocorgs/2025/cern.md

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+---
+title: "CERN"
+author: "Benedikt Hegner"
+layout: default
+organization: CERN
+logo: CERN-logo.jpg
+description: |
+  At [CERN](https://home.cern), the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. They use the world's largest and most complex scientific instruments to study the basic constituents of matter – the fundamental particles.
+---
+
+{% include gsoc_proposal.ext %}

_gsocorgs/2025/desy.md

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+---
+title: "DESY"
+author: "Frank Gaede"
+layout: default
+organization: DESY
+logo: DESY_logo.png
+description: |
+  The Deutsches Elektronen-Synchrotron (DESY) is a major German physics
+  laboratory with a long interest in high-energy physics. DESY is a
+  major centre for photon science and the site of the European XFEL
+  laser. DESY scientists are part of major international HEP experiments,
+  such as ATLAS, CMS and Belle II.
+---
+
+{% include gsoc_proposal.ext %}

_gsocprojects/2025/project_ROOT.md

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+---
+project: ROOT
+layout: default
+logo: ROOT-logo.png
+description: |
+  [ROOT](http://root.cern.ch) is a modular scientific software framework developed by [CERN](http://cern.ch) and other Particle Physics laboratories.
+  It was originally designed for particle physics data analysis, but it is also used in other applications such as astronomy, bio-informatics, finances, etc.
+  It provides all the functionalities needed to deal with big data processing, statistical analysis, data visualisation and data storage.
+summary: |
+  A modular scientific software framework. It provides all the functionalities needed to deal with big data processing,
+  statistical analysis, visualisation and storage.
+---
+
+{% include gsoc_project.ext %}