docs: add media management instruction

docs/how-to-guides/media-management.md

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+# Media management
+
+!!! warning
+
+    This is for educational purposes only :wink: Use it at your own risk!
+
+## Initial setup
+
+- Jellyfin `https://jellyfin.example.com`:
+    - Create an `admin` user and save the credentials to your password manager
+    - Add media libraries:
+        - Movies at `/media/movies`
+        - Shows at `/media/shows`
+- Radarr `https://radarr.example.com`:
+    - Authentication method: Forms
+    - Create an `admin` user and save the credentials to your password manager
+    - Navigate to Settings -> Download Clients -> Add -> Transmission (you can keep the default address and port)
+    - Navigate to Settings -> Media Management -> Add Root Folder `/movies`
+    - Navigate to Settings -> General -> API Key -> copy it for the next steps (or save it to your password manager)
+- Sonarr `https://sonarr.example.com`: same as Radarr but use `/shows` for the root folder
+- Prowlarr `https://prowlarr.example.com`:
+    - Authentication method: Forms
+    - Create an `admin` user and save the credentials to your password manager
+    - Navigate to Settings -> Apps -> Add:
+        - Radarr: paste the API key (you can keep the default address and port)
+        - Sonarr: same as Radarr
+    - Go back to Indexers -> Add New Indexers
+- Jellyseerr `https://jellyseerr.example.com`:
+    - Sign In
+        - Use your Jellyfin account
+        - URL: `https://jellyfin.example.com`
+        - Email: you can enter anything
+        - Username: `admin`
+        - Password: same as Jellyfin
+    - Configure Media Server
+        - Enable Movies and Shows
+    - Configure Services:
+        - Add Radarr Server:
+            - Default Server: true
+            - Name: Radarr
+            - Hostname: localhost
+            - Port: use default
+            - API Key: from previous step
+            - Click Test
+            - Quality Profile: choose whatever suits you
+            - Root folder: `/movies`
+            - External URL: `https://radarr.example.com`
+            - Enable Scan: true
+        - Add Sonarr Server: similar to Radarr
+
+Optionally, for convenience, you can add a `guest` account without a password in Jellyfin,
+allow access to all libraries, and allow that account to manage requests in Jellyseerr.
+
+## Usage
+
+Here's a suggested flow:
+
+- Users using the `guest` account can request media in Jellyseerr
+- Admins approve the request (or you can enable auto-approve)
+- Wait for the media to be downloaded
+- Watch on Jellyfin
+
+You may need to increase the volume size depending on your usage.