Database generator

[PenguinBoi12]

This PR aim to add the possibility to skip the database generation when creating a new project. Along those base features, major refactor have been brought to the application.py and config.py to support this feature.

When using the option --no-database, the project will not generate the following :

• db directory
• database configuration in config.py

The database can be added later on by using grace generate database.

[PenguinBoi12]

Add optional instructions when added later on

Add the following to your `config.py`:
    
    [database]
    config = database.cfg