[doc] update scipost ref and remove cvxpy from install instructions

Author: HugoStrand

doc/background/ppsc.rst

@@ -26,6 +26,6 @@ The ``triqs_xca`` solver implements the bold hybridization expansion using the D
 
 .. [#ppscintro] `M. Eckstein, P. Werner, Phys. Rev. B 82, 115115 (2010) <https://doi.org/10.1103/PhysRevB.82.115115>`_
 .. [#dlrhyb] `J. Kaye, Z. Huang, H. U.R. Strand, D. Golež, Phys. Rev. X 14, 031034 (2024) <https://doi.org/10.1103/PhysRevX.14.031034>`_
-.. [#xca] `Z. Huang, D. Golež, H. U.R. Strand, J. Kaye, arXiv:2503.19727 (2025) <https://doi.org/10.48550/arXiv.2503.19727>`_
+.. [#xca] `Z. Huang, D. Golež, H. U.R. Strand, J. Kaye, SciPost Phys. 19, 121 (2025) <https://doi.org/10.21468/SciPostPhys.19.5.121>`_
 .. [#cppdlr] `J. Kaye, H. U.R. Strand, N. Wentzell, J. Open Source Softw., 9(100), 6297, (2024) <https://doi.org/10.21105/joss.06297>`_
 .. [#dlr] `J. Kaye, K. Chen, O. Parcollet, Phys. Rev. B 105, 235115 (2021) <https://doi.org/10.1103/PhysRevB.105.235115>`_   

doc/install.rst

@@ -16,10 +16,6 @@ Prerequisites
 
    In the following, we assume that TRIQS is installed in the directory ``path_to_triqs``.
 
-#. The `cvxpy <https://www.cvxpy.org/>`_ Python package is required at runtime (it is a dependency of the adapol library which is built automatically)::
-
-    $ pip install cvxpy
-
 Installation steps
 ------------------