2.6.1: Update @angular/pwa to the latest version 🚀 (#308)

* fix(package): update @angular/pwa to version 0.801.0

v2.6.0: Better usability on phones + Height & Weight Tracking

• support for use on smaller screens (smartphones)
• NEW: basic height & weight tracking for children (see 'Health' section)
• various bug fixes

see https://github.com/Aam-Digital/ndb-core/milestone/12

2.5.3

fixed docker and travis path problems