Remove nf-slack instructions which should come from the plugin

Author: adamrtalbot

README.md

@@ -61,31 +61,6 @@ nextflow run nf-core/demo \
 
 For more details and further functionality, please refer to the [usage documentation](https://nf-co.re/demo/usage) and the [parameter documentation](https://nf-co.re/demo/parameters).
 
-## Slack Notifications
-
-The pipeline includes automatic Slack notifications via the nf-slack plugin. To enable Slack notifications:
-
-1. Create a Slack incoming webhook in your workspace:
-
-   - Go to your Slack workspace settings
-   - Navigate to "Apps" → "Incoming Webhooks"
-   - Create a new webhook and copy the URL
-
-2. Set the webhook URL as an environment variable:
-
-   ```bash
-   export SLACK_WEBHOOK_URL='https://hooks.slack.com/services/YOUR/WEBHOOK/URL'
-   ```
-
-3. Run your pipeline normally - notifications will be sent automatically:
-   - Pipeline start notification
-   - Pipeline completion notification (with task statistics)
-   - Pipeline failure notification (with error details)
-
-The plugin is configured to include command line details and resource usage statistics in the notifications. You can customize the notification settings in `nextflow.config` under the `slack` configuration block.
-
-For more information about the nf-slack plugin, visit the [nf-slack repository](https://github.com/seqeralabs/nf-slack).
-
 ## Pipeline output
 
 To see the results of an example test run with a full size dataset refer to the [results](https://nf-co.re/demo/results) tab on the nf-core website pipeline page.