[clang] [CIR][Docs][www] Generate and publish the CIR dialect reference docs (PR #232912)

[Bruno Cardoso Lopes via cfe-commits]

bcardosolopes wrote:

<img width="1682" height="1077" alt="Screenshot 2026-10-16 at 12 29 14 PM" src="https://github.com/user-attachments/assets/7e749fde-6779-4edc-a604-3624db204ff8" />
<img width="1660" height="884" alt="Screenshot 2026-10-16 at 12 29 01 PM" src="https://github.com/user-attachments/assets/4f74ec55-6a86-4dcd-ab44-9522184a43af" />


https://github.com/llvm/llvm-project/pull/232912