Update installation text

Imported from #186

Author: robinheidrich

pmaweb/templates/themes.html

@@ -9,14 +9,16 @@ <h2>Themes</h2>
 using.
 </p>
 <p>
-Please note that themes contain PHP code and you should download them only
-from trusted servers. All themes available on this page have been checked by
-phpMyAdmin team members.
+  Please note that themes contain PHP code and should only be downloaded from trusted servers.
+  All themes available on this page have been checked by phpMyAdmin team members.
 </p>
+
+<h3>Installation</h3>
 <p>
-To install a theme, unzip your downloaded theme into the directory /themes/ of
-your phpMyAdmin folder. When you open phpMyAdmin, you should be able to select the theme.
-Please read the documentation for more details.
+  To install a theme, unzip your downloaded theme into the <code>/themes/</code> directory of
+  your phpMyAdmin installation folder. After reloading phpMyAdmin, you should be able to select
+  the theme from the appearance settings. For more detailed instructions, please refer to
+  the documentation.
 </p>
 <p>
 You can try the themes in action on our <a