docs: improve airtime migration guide (#2564)

docs/admin-manual/install/migrate-from-airtime.md

@@ -13,6 +13,12 @@ Airtime **linked files** and **watched folders** features are either deprecated
 
 LibreTime dropped support for Ubuntu 16.04, which is the last supported version of Ubuntu that Airtime supports.
 
+To have a better understanding of the next steps, please read the following documentation before you continue:
+
+- [Upgrade documentation](./upgrade.md)
+- [Backup documentation](../backup.md)
+- [Install documentation](./install-using-the-installer.md)
+
 ## Make a backup
 
 ### Backup the configuration
@@ -26,7 +32,7 @@ You need to backup the PostgreSQL database, which holds the entire data of your
 Here is an example to dump your PostgreSQL database:
 
 ```bash
-sudo -u postgres pg_dump --file=airtime.sql airtime
+sudo -u postgres pg_dump --no-owner --no-privileges airtime > airtime.sql
 ```
 
 Please read the `pg_dump` usage for additional details.
@@ -39,13 +45,7 @@ The path to your storage was defined during the installation process, the defaul
 
 ## Install
 
-Install LibreTime on a new system by [running the installer](./README.md#run-the-installer), and **don't run the setup tasks**.
+Install LibreTime on a new system by [running the installer](./install-using-the-installer.md#run-the-installer), and **don't run the setup tasks**.
-
-## Restore the backup
-
-Restore [the Airtime backup](../backup.md#restore) on the newly installed LibreTime server.
-
-You have to restore the **database**, the **files storage** and the **configuration files**.
 
 ## Update the configuration files
 
@@ -53,6 +53,26 @@ Update the configuration file to match the new configuration schema and update a
 
 Edit the Icecast password in `/etc/icecast2/icecast.xml` to reflect the password used in Airtime.
 
+## Restore the backup
+
+Restore [the Airtime backup](../backup.md#restore) on the newly installed LibreTime server.
+
+You have to restore the **database**, and the **files storage**.
+
+Here is an example to restore your PostgreSQL database:
+
+```bash
+sudo -u libretime libretime-api dbshell < airtime.sql
+```
+
+## Apply migrations
+
+Run the following command to apply the database migrations:
+
+```bash
+sudo -u libretime libretime-api migrate
+```
+
 ## Finish
 
 Restart the LibreTime services and navigate to the LibreTime web-page.