GitLab

## Description
Removed auto generation of Handbook since with the new versions GC won't exit when finished generating it, so the script was stuck, and for some reason if you stop GC manually, the script won't continue.
Added a recommendation to generate HB manually.

## Type of changes

- [x] Bug fix
- [ ] New feature 
- [x] Enhancement
- [ ] Documentation

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] My pull request is unique and no other pull requests have been opened for these changes
- [x] I have read the [Contributing note](https://github.com/Grasscutters/Grasscutter/blob/stable/CONTRIBUTING.md) and [Code of conduct](https://github.com/Grasscutters/Grasscutter/blob/development/CODE_OF_CONDUCT.md)
- [x] I am responsible for any copyright issues with my code if it occurs in the future.