Implement GitHub API functionality

[vvidday]

Implement functionality to:
- [ ] Fork publish-RepoSense repository
- [ ] Activate GitHub Actions on forked repository

• Enable workflow write permissions
• Enable GitHub Pages & set branch
• Re-run a selected workflow
• Update run.sh and config files (repo-config.csv, author-config.csv etc) in forked repository
• Handle exceptions in the above actions (e.g. already has existing repo)

These will be required to perform the actual underlying functionality of the wizard, to generate the report for the user.

See https://github.com/reposense/RepoSense/blob/1430_feature_branch/reposense-wizard/src/store/githubStore.js for reference.

Ideally would include tests as well, maybe with mock data.