Rename MongoDB Ext package

Description
The MongoDB Audit and Directories addon enables to use MongoDB to store audit and directories data.

Details
### Usage
Usage is transparent, the package just allows to determine where the data is stored: in MongoDB.

### Installation
The MongoDB Audit and Directories addon requires the installation of the corresponding Nuxeo package.

### Configuration
After your installed the addon, you need to add the [templates](https://doc.nuxeo.com/nxdoc/configuration-templates/) `mongodb-audit` and `mongodb-directory` to configure your Nuxeo server to store audit and directories in MongoDB.