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/plugins/cms/contentful/index.md

@@ -113,7 +113,7 @@ You can find the format of the PostgreSQL database URL in [PostgreSQL’s docume
 
 :::
 
-Then, in `medusa-config.js` in the exported object, comment out or remove the SQLite database configurations and add the PostgreSQL database configurations:
+Then, in `medusa-config.js` in the exported object, add the PostgreSQL database configurations:
 
 ```jsx title=medusa-config.js
 module.exports = {
@@ -121,9 +121,6 @@ module.exports = {
     // ...
     database_url: DATABASE_URL,
     database_type: "postgres",
-    // REMOVE OR COMMENT OUT THE BELOW:
-    // database_database: "./medusa-db.sql",
-    // database_type: "sqlite",
   },
 }
 ```

docs/content/plugins/cms/strapi.md

@@ -86,32 +86,35 @@ You can use the Strapi plugin on an existing Medusa backend, however, existing d
 To create your Medusa backend, run the following command:
 
 ```bash
-medusa new medusa-backend --seed
+medusa new medusa-backend
 ```
 
-The `--seed` flag creates an SQLite database and seeds it with some demo data.
-
 ### Configure your Backend
 
-Once the command is done executing, change to the newly created `medusa-backend` directory. Then, in `medusa-config.js`, change the exported object at the end of the file to enable Redis:
+Once the command is done executing, change to the newly created `medusa-backend` directory:
 
-```jsx title=medusa-config.js
-module.exports = {
-  projectConfig: {
-    redis_url: REDIS_URL,
-    // ...
-  },
-  // ...
-}
+```bash
+cd medusa-backend
 ```
 
-This uses the default Redis configurations. If you want to learn more about configuring Redis, [check out this documentation](../../development/backend/configurations.md#redis).
+You must then configure your backend to:
 
-:::tip
+- Connect to a PostgreSQL database, as explained [here](../../development/backend/configurations.md#database-configuration)
+- Install and configure an event-bus module, as explained [here](../../development/backend/configurations.md#recommended-event-bus-modules)
 
-It is also recommended to use PostgreSQL for an optimal experience, however, it is not required. Learn how to [install](../../development/backend/prepare-environment.mdx#postgres) and [configure](../../development/backend/configurations.md#postgresql-configurations) it on your Medusa backend.
+### Run Migrations
 
-:::
+After configuring the connection to the database, you must run migrations to add the necessary database schema definitions in your database. To do that, run the following command in the `medusa-backend` directory:
+
+```bash
+medusa migrations run
+```
+
+You can optionally seed your database with demo data by running the `seed` command:
+
+```bash
+medusa seed --seed-file=data/seed.json
+```
 
 ---