docs: link to CV32A60X design documentation (#2931)

Author: ASintzoff

docs/07_cv32a60x/index.rst

@@ -8,8 +8,11 @@ CV32A60X documentation
    riscv/unpriv.rst
    riscv/priv.rst
 
-Below are links to RISC-V ISA documents tailored for OpenHW Group CV32A60X.
+Below are links to RISC-V ISA documents tailored for OpenHW Group CV32A60X
+and to design documentation.
 Only those CSRs and Instruction Sets that are supported by the CV32A60X are documented here.
 
 | `Unprivileged RISC-V ISA <https://cva6-cv32a60x.readthedocs.io/en/latest/07_cv32a60x/riscv/unpriv.html>`_
 | `Privileged RISC-V ISA <https://cva6-cv32a60x.readthedocs.io/en/latest/07_cv32a60x/riscv/priv.html>`_
+| `Design Documentation for CV32A60X architecture <https://cva6-cv32a60x.readthedocs.io/en/latest/07_cv32a60x/design/design-cv32a60x.html>`_
+