[clang] [clang] Add sections to C++ DR status page (PR #165749)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

New look of C++ DR status page: 
<img width="1698" height="755" alt="image" src="https://github.com/user-attachments/assets/850e5d46-c3eb-4c93-8624-0c096c1a0cff" />


https://github.com/llvm/llvm-project/pull/165749