refactor(changelog): move CHANGELOG.md to repo root and add v2.0.11/v2.0.10 releases

- Moved packages/cli/CHANGELOG.md → CHANGELOG.md
- Removed packages/socket/CHANGELOG.md (use root)
- Added gitignore rules for CHANGELOG, LICENSE, images copied during publish
- Added v2.0.11: progressive enhancement, checksums, Windows fixes
- Added v2.0.10: tab completion, SDK, output, directory fixes

Author: jdalton