The events description text in the add to calendar feature include HTML tags

[Mohamad Berjawi]

Describe the bug
The events description text in the add to calendar feature is not stripped from HTML

To Reproduce
Steps to reproduce the behavior:

1. Go to 'josa.ngo/events'](https://josa.ngo/events'
2. Click on an ongoing event
3. Click on the add to calendar button
4. Choose your preferred calendar
5. See the description of the event you will notice that it include HTML tags

Screenshots

The event description should be stripped from the HTML tags.