Update POSTGRES.md to document manual configuration

- Remove GUI configuration option (not yet implemented)
- Clarify that Settings.json must be edited manually
- Update reverting to SQLite instructions
- Specify default Settings.json location

Author: Cut5nake

POSTGRES.md

@@ -77,23 +77,7 @@ GRANT ALL PRIVILEGES ON DATABASE gpodder TO gpodder;
 
 ## Configuration
 
-### Option 1: GUI Settings (Recommended)
-
-1. Open gPodder
-2. Go to Preferences/Settings
-3. Navigate to the Database section
-4. Set database type to `postgres`
-5. Fill in your PostgreSQL connection details:
-   - Host: `localhost` (or your PostgreSQL server address)
-   - Port: `5432` (default PostgreSQL port)
-   - Database: `gpodder`
-   - User: `gpodder`
-   - Password: your password
-6. Restart gPodder
-
-### Option 2: Manual Configuration
-
-Edit your `Settings.json` file (located in your GPODDER_HOME directory):
+Edit your `Settings.json` file (located in your GPODDER_HOME directory, typically `~/.config/gpodder/Settings.json`):
 
 ```json
 {
@@ -269,13 +253,17 @@ If you see schema version warnings, this means your PostgreSQL database was crea
 
 ## Reverting to SQLite
 
-To switch back to SQLite:
+To switch back to SQLite, edit your `Settings.json` and change the database type:
 
-1. Open gPodder settings
-2. Change database type back to `sqlite`
-3. Restart gPodder
+```json
+{
+  "database": {
+    "type": "sqlite"
+  }
+}
+```
 
-Your PostgreSQL data will remain untouched in the database.
+Then restart gPodder. Your PostgreSQL data will remain untouched in the database.
 
 ## Security Considerations