Update readme.md

Author: ^cypher

conferences/conference-2025/readme.md

@@ -96,6 +96,7 @@ FHE.org 2025 gratefully acknowledges the financial support of <i>(in alphabetica
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+<span style="padding-right:10px"><a href="https://phantom.zone/"><img src="https://github.com/user-attachments/assets/01646cc6-aca2-4110-a1ec-4a1151c2c122" width="150px"></a></span>
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