Remove rest of the form parameters as we can't really support them

app/views/projects/services/mattermost_slash_commands/_help.html.haml

@@ -7,6 +7,9 @@
   See list of available commands in Mattermost after setting up this service,
   by entering
   %code /<command_trigger_word> help
-  = render 'projects/services/mattermost_slash_commands/detailed_help', subject: @service unless enabled
 
-= render 'projects/services/mattermost_slash_commands/installation_info' if enabled
+  - unless enabled
+    = render 'projects/services/mattermost_slash_commands/detailed_help', subject: @service
+
+- if enabled
+  = render 'projects/services/mattermost_slash_commands/installation_info', subject: @service

app/views/projects/services/mattermost_slash_commands/_installation_info.html.haml

 .services-installation-info
-  .row
-    %strong.col-sm-3.text-right Status
-    .col-sm-9= @service.activated? ? 'Installed' : 'Not installed'
-  .row
-    %strong.col-sm-3.text-right Mattermost
-    = link_to pretty_url(Gitlab.config.mattermost.host), Gitlab.config.mattermost.host, class: 'col-sm-9', target: '__blank'
   - unless @service.activated?
-    .row
-      %strong.col-sm-3.text-right Installation
-      .col-sm-9
-          To install this service, press
-          %strong Add to Mattermost
-          and follow the instructions
     .row
       .col-sm-9.col-sm-offset-3
         = link_to new_namespace_project_mattermost_path(@project.namespace, @project), class: 'btn btn-lg' do