docs: add configuration to use knex with Next.js or Vite

[rafaelcitario]

Integrating Knex.js with Next.js or Vite

I've been trying to implement Knex in my applications using Next.js and Vite, but I keep encountering errors.
An old way to use Knex was with node --loader, but this was discontinued in Node 18.

I found a way to implement it using the Knexfile with the .js extension and adding a companion file that I called database.config.mjs.
It's very important to follow this extension configuration: Knexfile.js and database.config.mjs.

What I do in the documentation:

• Installation and configuration methods for Knex.
• Configuration methods for the Knexfile.js and database.config.mjs files.
• Guidance for the user to add type: module in package.json.
• Final line with the command for creating a migration example.