Update with nicer images (#3907)

closes #3771

Author: beckykd

docs/guides/qunova-chemistry.ipynb

@@ -62,7 +62,7 @@
     "\n",
     "The Handover Iterative Variational Quantum Eigensolver (HI-VQE) is an innovative hybrid quantum-classical method for accurately estimating the ground state of molecular systems. It integrates quantum hardware with classical computing, using quantum processors to efficiently explore candidate electron configurations and calculating the resulting wave function on classical computers. By generating compact yet chemically accurate wave functions, HI-VQE enhances research and discovery in quantum chemistry and materials science.\n",
     "\n",
-    "![Image showing an overview of Qunova's HI-VQE algorithm](/docs/images/guides/qunova-chemistry/overview.avif)\n",
+    "![Image showing an overview of Qunova's HI-VQE algorithm](/docs/images/guides/qunova-chemistry/overview.svg)\n",
     "\n",
     "HI-VQE reduces the computational complexity of the electronic structure problem by efficiently estimating the ground state with high accuracy. It focuses on a carefully selected subset of the most relevant electron configurations, optimizing both accuracy and efficiency.\n",
     "\n",