Updating images and light theme images (#172)

- Updated images
- Added link to mobile app
- Remove obsolet image

Author: Nirus2000

docs/en/reference/help/check-updates.md

@@ -9,6 +9,11 @@ changes:
       - Fix links
       - Added detailed instructions on manual and automatic update checks
       - Added success confirmation after update installation
+  - date: 2025-06-23
+    author: Nirus2000
+    description:
+      - Updated images
+      - Added link to mobile app
 ---
 
 After installation, you can check for updates manually or let the program check automatically on startup.
@@ -25,12 +30,13 @@ If no updates are available, you will see a confirmation that your version is cu
 
 Figure: Update available {class="pp-figure"}
 
-![](images/installation-update-2.png)
+![](images/installation-update.png)
 
 Click `OK` to install the latest version, or `Cancel` to keep your current version.
 
 At the top of the update panel, there are three useful links:
 
+- [App for iPhone and Android](https://www.portfolio-performance.app): Information about the mobile companion app and links to the App Store and Google Play.
 - [New & Noteworthy](https://forum.portfolio-performance.info/t/new-noteworthy/17945/last): Detailed info about the latest and previous releases.
 - [Change Log](https://github.com/portfolio-performance/portfolio/releases): GitHub page listing all releases.
 - [Download](https://www.portfolio-performance.info/): Official homepage with installers for Linux, Windows, and macOS (see [Getting Started > Installation](../../getting-started/installation.md)).
@@ -44,18 +50,18 @@ Figure: Install update successful {class="pp-figure"}
 ![](images/check-for-update-successful.png)
 
 !!! Tip
-    If the update process fails (e.g. due to missing permissions or network issues), you can always download and install the latest version manually from the [official website](https://www.portfolio-performance.info/).
+If the update process fails (e.g. due to missing permissions or network issues), you can always download and install the latest version manually from the [official website](https://www.portfolio-performance.info/).
 
 ## Automatic Check for Updates
 
 Automatic update checks are enabled by default. To change this, go to `Help > Settings > Updates` and toggle `Check for updates on start`:
 
 Figure: Automatic update check setting {class="pp-figure"}
-  
+
 ![](images/automatic-check-for-update.png)
 
 !!! Note
-    The automatic check is performed only when the application starts. There is no background download or silent installation.
+The automatic check is performed only when the application starts. There is no background download or silent installation.
 
-**Technical Info**
-The update check fetches data from [https://updates.portfolio-performance.info/portfolio](https://updates.portfolio-performance.info/portfolio). If the update check fails, check your internet connection or firewall/proxy settings. Manual updates are always possible via the [download page](https://www.portfolio-performance.info/).
+!!! Info
+The update check fetches data from [https://updates.portfolio-performance.info/portfolio](https://updates.portfolio-performance.info/portfolio). If the update check fails, check your internet connection or firewall/proxy settings. Manual updates are always possible via the [download page](https://www.portfolio-performance.info/).