[FR] Self-hosted : Use template : not supported

[MADAOKAKU]

Describe the bug
When accessing the template page at https://appflowy.io/templates/ and clicking on ‘Use this template’, the template cannot be imported into the self-hosted version of AppFlowy.

To Reproduce
Steps to reproduce the behavior:

1. Go to the template page at https://appflowy.io/templates/.
2. Click on ‘Use this template’ for the desired template.
3. Attempt to import the template into your self-hosted AppFlowy instance.

Expected behavior
Upon clicking ‘Use this template’ on the https://appflowy.io/templates/ page, the selected template should be successfully imported into the self-hosted AppFlowy instance without any issues. An appropriate confirmation message should be displayed to indicate that the import process was completed successfully.