add collabora overview in user

docs/user/collabora.md

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+---
+sidebar_position: 10
+id: collabora
+title: Collabora in OpenCloud
+description: Collabora in OpenCloud
+draft: false
+---
+
+# Collabora Online in OpenCloud
+
+Collabora Online allows you to to create / edit documents (text, spreadsheets, presentations) directly in your browser without any additional software.  
+The integration with OpenCloud provides seamless access to your files and enables real-time collaboration.
+
+## Features in OpenCloud
+
+### Open files directly from the cloud
+
+All documents stored in OpenCloud can be opened directly in Collabora.
+
+### Collaborative editing
+
+Multiple users can work on the same document simultaneously, with real-time synchronization of changes.
+
+### Insert images from OpenCloud
+
+You can insert images stored in OpenCloud directly into your documents.
+
+### Auto-Save and versioning
+
+Changes are saved automatically, and all versions are retained within OpenCloud.
+
+### Supported formats
+
+Collabora Online supports common office formats such as `.odt`, `.docx`, `.ods`, `.xlsx`, `.odp`, and more.
+
+## Notes
+
+- Performance depends on your internet connection and the size of the document.
+- For advanced features or detailed instructions, we refer to the [official Collabora Online documentation](https://www.collaboraoffice.com/collabora-online/).

docs/user/common-issues.md

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 ---
-sidebar_position: 10
+sidebar_position: 11
 id: common-issues
 title: Common Issues & Help
 description: Common issues & help