[README] tetsing image centering

README.md

@@ -161,8 +161,9 @@ transitive_checking: true  # if 'false': the dependency checking process will be
 ![url_search](https://raw.githubusercontent.com/vinifmor/bauh/wgem/pictures/web/url_search.gif)
 
 - It offers the possibility to customize the generated app the way you want:
-
-![options](https://raw.githubusercontent.com/vinifmor/bauh/wgem/pictures/web/options.png)
+<p align="center">
+    ![options](https://raw.githubusercontent.com/vinifmor/bauh/wgem/pictures/web/options.png)
+<p/>
 
 - It provides some suggestions coming with predefined settings, and they also can be retrieved by their names. They are
 defined at [suggestions.yml](https://github.com/vinifmor/bauh-files/blob/master/web/suggestions.yml), and downloaded during the application usage.
@@ -180,7 +181,9 @@ attach it to the generated app.
 - If the Tray Mode **Start Minimized** is defined during the installation setup, a desktop entry will be also generated at **~/.config/autostart**
 allowing the application to launch automatically after the system's boot attached to the tray.
 
+<p align="center">
 ![tray_mode](https://raw.githubusercontent.com/vinifmor/bauh/wgem/pictures/web/tray.gif)
+</p>
  
 - The configuration file is located at **~/.config/bauh/web.yml** and it allows the following customizations:
 ```