build(deps-dev): bump angular-cli-ghpages from 1.0.7 to 2.0.0

Bumps [angular-cli-ghpages](https://github.com/angular-schule/angular-cli-ghpages) from 1.0.7 to 2.0.0.
- [Release notes](https://github.com/angular-schule/angular-cli-ghpages/releases)
- [Commits](https://github.com/angular-schule/angular-cli-ghpages/commits/v2.0.0)

---
updated-dependencies:
- dependency-name: angular-cli-ghpages
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>