GitLab

The PyTorch codebase has migrated from the C++14 to the C++17
standard, see: https://github.com/pytorch/pytorch/pull/100557

docs: add GH button in support of Ukraine

## Summary
Our mission at Meta Open Source is to empower communities through open source, and we believe that it means building a welcoming and safe environment for all. As a part of this work, we are adding this banner in support for Ukraine during this crisis.

Use references where possible