add orama-db generator

[AugustinMauroy]

We need to generate a local Orama db. To accomplish that we will you the open source part of Orama. On nodejs.org we use orama cloud to build our search bar.

To build that, there are some step:

• Create the Orama js object (call db) Create a new Orama instance
• Insert data in this object Insert Data
• Create json of the db Data Persistence.

And on further step we will be able to use the generated db in the docs app.