- Add pytorch_overview.md
- Add pytorch_main_components.md
- Reorganize top nav to have Get Started, User Guide, Reference API, Community, Tutorials
- Move notes under user guide
Pull Request resolved: https://github.com/pytorch/pytorch/pull/159379
Approved by: https://github.com/albanD
Co-authored-by: sekyondaMeta <127536312+sekyondaMeta@users.noreply.github.com>
Co-authored-by: Nikita Shulga <2453524+malfet@users.noreply.github.com>
