Add repo update and create-from-template

[lbrealdev]

Summary

Implements two features tracked in #101 and #102:

• repo update — PATCH /repos/{owner}/{repo} for description, homepage, visibility, default branch, archive state, rename via --new-name, and template status via --as-template / --no-template
• repo create --template OWNER/REPO — POST /repos/{template_owner}/{template_repo}/generate, with optional --include-all-branches

Also removes CHANGELOG.md; release notes live in GitHub Releases (see CONTRIBUTING.md).

repo get table output now includes is_template so template status is visible without JSON.

CLI examples

github-rest-cli repo update --name my-repo --description "Updated" --private
github-rest-cli repo update --name my-repo --new-name renamed-repo
github-rest-cli repo update --name my-repo --as-template
github-rest-cli repo get --name my-repo
github-rest-cli repo update --name my-repo --no-template
github-rest-cli repo create --name my-app --template owner/template-repo --private

Notes

• --template cannot be combined with --empty
• Template create supports --public / --private only (not --internal)
• --include-all-branches requires --template
• --name is the current repository; --new-name renames it
• --as-template / --no-template mark or unmark a repo as a template (distinct from create --template)
• Docs updated in docs/cli.md and README

Testing

• uv run pytest — green including is_template table field tests
• ruff check / ruff format on touched files

Closes #101
Closes #102

  

[cursor]

Bugbot is not enabled for your account, so this pull request was not reviewed.

Enable Bugbot in the Cursor dashboard to get automatic reviews on future PRs.