Bump hexo-generator-index from 2.0.0 to 3.0.0

Bumps [hexo-generator-index](https://github.com/hexojs/hexo-generator-index) from 2.0.0 to 3.0.0.
- [Release notes](https://github.com/hexojs/hexo-generator-index/releases)
- [Commits](hexojs/hexo-generator-index@2.0.0...v3.0.0)

---
updated-dependencies:
- dependency-name: hexo-generator-index
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]