Add Arnaud Becheler's profile to team page

Added a new team member profile for Arnaud Becheler, including details about his background, contributions, and current work.

Author: Becheler

people/arnaud.html

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+---
+layout: team
+nav-class: dark
+member-name: Arnaud Becheler
+id: arnaud
+title: Arnaud Becheler | The C++ Alliance
+position: Staff Engineer
+email: arnaud.becheler@gmail.com
+github: https://github.com/Becheler
+linkedin: https://www.linkedin.com/in/arnaud-becheler-8902313a1/
+site: https://becheler.github.io/
+image: /images/people/arnaud.jpg
+---
+<p>Arnaud Becheler is a Staff Engineer and C++ consultant with over a decade of experience,
+  holding a PhD in Computational Genetics. With quite an unusual path — from statistical evolutionary biology
+  through academia to modern software engineering — comes an unusual ability to bridge scientific rigour and
+  production-quality C++ design.</p>
+<p>He is the author of the <a href="https://github.com/Becheler/quetzal-CoaTL">Quetzal framework</a>, a suite of
+  open-source C++ libraries providing reusable components for building geospatial population genetics simulators.
+  A Boost enthusiast and active contributor to the C++ community, Arnaud organizes C++ Meetups in Paris and
+  speaks at conferences. He is passionate about modern C++ architecture, policy-based design,
+  applied mathematics, and helping developers from scientific backgrounds write maintainable, testable, and efficient code.
+  Currently, his work at the Alliance is focused on revitalizing the Boost Graph Library and bringing Community Detection
+  Methods to its current algorithms coverage.
+</p>
+<p> Beyond code, Arnaud is a dedicated teacher and community builder: he runs C++ training sessions, writes extensively on his blog, 
+  and believes that great software culture and a better world grow when knowledge is shared generously and made accessible to 
+  everyone: students, civil society, scientists and engineers alike.
+</p>