docs: admin-only library settings (#7716)

* document admin-only library settings

* renew library guide

docs/docs/guides/external-library.md

@@ -11,23 +11,11 @@ Edit `docker-compose.yml` to add two new mount points under `volumes:`
 ```
   immich-server:
     volumes:
-      - ${EXTERNAL_PATH}:/usr/src/app/external
+      - /path/to/photos/on/host:/usr/src/app/external
 ```
 
 Be sure to add exactly the same line to both `immich-server:` and `immich-microservices:`.
 
-Edit `.env` to define `EXTERNAL_PATH`, substituting in the correct path for your computer:
-
-```
-EXTERNAL_PATH=<your-path-here>
-```
-
-On my computer, for example, I use this path:
-
-```
-EXTERNAL_PATH=/home/tenino/photos
-```
-
 Restart Immich.
 
 ```
@@ -35,42 +23,21 @@ docker compose down
 docker compose up -d
 ```
 
-# Set the External Path
+# Create the library
 
 In the Immich web UI:
 
 - click the **Administration** link in the upper right corner.
   <img src={require('./img/administration-link.png').default} width="50%" title="Administration link" />
 
-- Select the **Users** tab
-  <img src={require('./img/users-tab.png').default} width="50%" title="Users tab" />
+- Select the **External Libraries** tab
+  <img src={require('./img/external-libraries.png').default} width="50%" title="External Libraries tab" />
 
-- Select the **pencil** next to your user ID
-  <img src={require('./img/pencil.png').default} width="50%" title="Pencil" />
+- Click the **Create Library** button
+  <img src={require('./img/create-external-library.png').default} width="50%" title="Create Library button" />
 
-- Fill in the **External Path** field with `/usr/src/app/external`
-  <img src={require('./img/external-path.png').default} width="50%" title="External Path field" />
-
-Notice this matches the path _inside the container_ where we mounted your photos.
-The purpose of the external path field is for administrators who have multiple users
-on their Immich instance. It lets you prevent other authorized users from
-navigating to your external library.
-
-# Import the library
-
-In the Immich web UI:
-
-- Click your user avatar in the upper-right corner (circle with your initials)
-  <img src={require('./img/user-avatar.png').default} width="50%" title="User avatar" />
-
-- Click **Account Settings**
-  <img src={require('./img/account-settings.png').default} width="50%" title="Account Settings button" />
-
-- Click to expand **Libraries**
-  <img src={require('./img/libraries-dropdown.png').default} width="50%" title="Libraries dropdown" />
-
-- Click the **Create External Library** button
-  <img src={require('./img/create-external-library-button.png').default} width="50%" title="Create External Library button" />
+- In the dialog, select which user should own the new library
+  <img src={require('./img/library-owner.png').default} width="50%" title="Library owner diaglog" />
 
 - Click the three-dots menu and select **Edit Import Paths**
   <img src={require('./img/edit-import-paths.png').default} width="50%" title="Edit Import Paths menu option" />