removed link to wordpress plugins page

docs/installation-and-operations/configuration/plugins/README.md

@@ -6,13 +6,17 @@ sidebar_navigation:
 
 # Adding plugins (DEB/RPM packages)
 
-Note: this guide only applies if you've installed OpenProject using our DEB/RPM packages.
+<div class="alert alert-info" role="alert">
+**Note**: this guide only applies if you've installed OpenProject using our DEB/RPM packages.
+</div>
 
-A [number of plugins](https://www.openproject.org/plugins/) exist for use with OpenProject. Most plugins that are maintained by us are shipping with OpenProject, however there are several plugins contributed by the community.
+A number of plugins exist for use with OpenProject. Most plugins that are maintained by us are shipping with OpenProject, however there are several plugins contributed by the community.
 
 Previously, using them in a packaged installation was not possible without losing your changes on every upgrade. With the following steps, you can now use third party plugins.
 
-Note: We cannot guarantee upgrade compatibility for third party plugins nor do we provide support for them. Please carefully check whether the plugins you use are available in newer versions before upgrading your installation.
+<div class="alert alert-info" role="alert">
+**Note**: We cannot guarantee upgrade compatibility for third party plugins nor do we provide support for them. Please carefully check whether the plugins you use are available in newer versions before upgrading your installation.
+</div>
 
 ## Add a custom Gemfile