Add new sandbox (#741)

* Add new sandbox files and remove temporary unavailable notice
* remove old deployment script
* adapt application properties
* restructure hawkbit-runtime
* move sandbox description.
* adapt license checks
* Introduce review findings and add new docker files
* Remove redundant profile and attribute
* Update website
* redirect to sandbox
* getting started
* Add description for docker folder and renew favicon

hawkbit-runtime/.sandbox/README.md

@@ -0,0 +1,55 @@
+hawkBit Sandbox
+===
+
+## Try out the update server in our hawkBit sandbox
+
+- try out Management UI https://hawkbit.eclipse.org (username: demo, passwd: demo)
+- try out Management API https://hawkbit.eclipse.org/rest/v1/targets (don't forget basic auth header; username: demo, passwd: demo)
+- try out DDI API https://hawkbit.eclipse.org/DEFAULT/controller/v1/MYTESTDEVICE 
+
+
+## Sandbox Setup
+
+**1. File Structure** 
+
+Copy the files to the respective location on the VM. 
+
+```
+/
++.sandbox
+  |
+  +-stacks
+  |  +-sandbox
+  |  |   +-docker-compose-stack.yml
+  |  +-proxy
+  |      +-docker-compose-stack.yml  
+  +- scripts
+     +-intialize-cronjobs.sh
+     +-sandbox-cleanup.sh 
+```
+
+**2. Initialize Cronjobs**
+
+Reset the Sandbox once a week with a cron-job and log its output.
+
+```
+$ sudo /.sandbox/scripts/initialize-cronjobs.sh
+```
+
+
+**3. Nginx Reverse Proxy**
+
+Start the stack for the Nginx reverse proxy with Let's Encrypt support. Thanks to JrCs for providing the Docker container
+ and instructions with his [Docker-Letsencrypt-Nginx-Companion](https://github.com/JrCs/docker-letsencrypt-nginx-proxy-companion).
+
+```
+$ docker stack deploy -c /.sandbox/stacks/sandbox/docker-compose-stack.yml proxy
+```
+
+**4. hawkBit**
+
+Start the hawkBit stack.
+
+```
+$ docker stack deploy -c /.sandbox/stacks/sandbox/docker-compose-stack.yml hawkbit
+```