updated pdf to arxiv v2

Author: magnusdierking

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@@ -72,7 +72,7 @@ <h1 class="title is-1 publication-title">Ark: An Open-source Python-based Framew
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-              <a href="static/images/ark_framework_2025.pdf"
+              <a href="static/images/2506.21628v2.pdf"
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