- Add upgrading-spec-kit.md with detailed upgrade instructions and troubleshooting
- Update table of contents to include upgrading guide in Getting Started section
- Update documentation index and README links
- Address user questions about updating initialized projects from GitHub discussions
Co-authored-by: GitHub Copilot <github.copilot@github.com>
Signed-off-by: Ashley Childress <6563688+anchildress1@users.noreply.github.com>
