Update README.md
Remove broken link. Fix #1377
Change-Id: I8184962df661ddc1cdb922620a31f186aef67815
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need yet another app, e. g. DAVx5. That’s necessary because a Caldav client
isn't included in Etar.
- The following [link](https://ownyourbits.com/2017/12/30/sync-nextcloud-tasks-calendars-and-contacts-on-your-android-device/) provides a tutorial how to use Nextcloud + DAVx5 + Etar.
-
### Technical explanation
On Android there are "Calendar providers". These can be calendars that are
synchronized with a cloud service or local calendars. Basically any app