MARP-1838 Removing duplication in README_DE (#29)

mattermost-connector-product/README_DE.md

@@ -9,46 +9,3 @@ Dieser Konnektor:
 - ermöglicht es dir, den Axon Ivy-Prozess durch Eingabe des Slash-Kommandos im Mattermost-Kanal zu starten.
 - ermöglicht das Senden von Nachrichten an den Mattermost-Kanal aus der Axon Ivy-Oberfläche.
 - benachrichtigt Benutzer im Kanal über neue Axon Ivy-Workflow-Aufgaben.
-
-## Demo
-
-1. Hit the slash command key on the channel's chat.
-The Axon Ivy process will be triggered and create a new task.
-The task's information will be sent to the channel by a message.
-
-![call-slash-command](images/slash-command.png)
-
-2. Click on the link, start and finish task.
-The data from this task will be sent back to the channel.
-
-![task-notification-from-ivy](images/task-notification-from-ivy.png)
-
-### Setup
-
-Mattermost Instance
-
-1. Ref to [Deploy Mattermost](https://docs.mattermost.com/guides/deployment.html).
-2. Create Team, User, ...
-3. Go to the System Console to enable Personal Access Tokens
-![enable-personal-access-token](images/enable-personal-access-token.png)
-4. Go to the Profile and create Personal Access Tokens on the Security tab. The Access Token is used for the ivy variable configuration.
-![create-personal-access-token](images/create-personal-access-token.png)
-5. Enable Bot Account Creation and create a bot account for sending notification to the channel Axon Ivy. E.g. axonivy-bot
-6. Create a slash command in the Integrations menu.
-![create-slash-command](images/create-slash-command.png)
-7. Create a incoming webhook for the channel that the axonivy can use and post data to the selected channel.
-![create-incoming-webhook](images/create-incoming-webhook.png)
-
-Add the following `Variables` to your `variables.yaml`:
-
-- `Variables.mattermost.baseUrl`
-- `Variables.mattermost.accessToken`
-- `Variables.mattermost.teamName`
-- `Variables.mattermost.botName`
-
-and replace the values with your given setup.
-
-```
-@variables.yaml@
-```
-