docs: remove mentions of SQLite (#4045)

* docs: removed mentions of sqlite

* removed mentions of the seed option

* remove sidebar link

* Made PostgreSQL a required tool

* fixed heading

docs/content/development/entities/migrations/overview.mdx

@@ -9,12 +9,6 @@ import Icons from '@theme/Icon';
 
 In this document, you'll learn what Migrations are in Medusa.
 
-:::note
-
-Medusa’s Migrations do not work with SQLite databases. They are intended to be used with PostgreSQL databases, which is the recommended database for using Medusa in production.
-
-:::
-
 ## What are Migrations
 
 Migrations are scripts that are used to make additions or changes to your database schema. In Medusa, they are essential for both when you first install your backend and for subsequent backend upgrades later on.