Update some online things

[danielpeintner]

Based on eclipse-thingweb/test-things#51
we can update some online Things

I wonder

• what we shall do with the CoAP endpoints ?
• whether we shall update http://plugfest.thingweb.io:8083/smart-coffee-machine with http://plugfest.thingweb.io/http-advanced-coffee-machine

Yet another alternative is to stress the https://github.com/eclipse-thingweb/test-things/ repo and remove all links!?

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[danielpeintner]

As decided in our last committers meeting, I removed most of the details about test things by pointing to https://github.com/eclipse-thingweb/test-things/.

Note: Some parts might need to find a new home, like the UIs and the links to vaimee.