Introduce new, Hugo templates based, website (#713)

* Add new hugo-based website for hawkBit

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

* Fix broken links + wordings
- , i.e. -> i.e,
- , e.g. -> e.g.,
- hawkbit -> hawkBit
- don't -> do not
- isn't -> is not

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

* Remove old documentation and add maven integration

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

* Add Intellij files to ignore

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

* Update README

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

* Update Copyright header
* exclude website artifacts

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

* Harmonize usage of i.e. and e.g.

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

* Add remark for windows user

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

* Fix indention

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

* Introduce review findings

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

* Change image in 'run hawkbit' guide

Signed-off-by: Jeroen Laverman <jeroen.laverman@bosch-si.com>

docs/content/guides/feignclient.md

@@ -0,0 +1,62 @@
+---
+title: Feign Client
+parent: Guides
+weight: 32
+---
+
+In this guide we describe how to create a [Feign](https://github.com/Netflix/feign) Rest Client based on a  [Spring Boot](http://projects.spring.io/spring-boot/) Application. 
+<!--more-->
+
+## Create Feign REST Client
+hawkBit provides REST interfaces for [Management API](https://github.com/eclipse/hawkbit/tree/master/hawkbit-ddi-api) and [DDI API](https://github.com/eclipse/hawkbit/tree/master/hawkbit-ddi-api). Using this interfaces you can create a feign client with the help of the [feign inheritance support](http://projects.spring.io/spring-cloud/spring-cloud.html#spring-cloud-feign-inheritance).
+Our [example](https://github.com/eclipse/hawkbit-examples) modules demonstrate how to create [Feign](https://github.com/Netflix/feign) client resources. Here you can find the [Management API client resources](hhttps://github.com/eclipse/hawkbit-examples/tree/master/hawkbit-example-mgmt-feign-client) and the [DDI client resources](https://github.com/eclipse/hawkbit-examples/tree/master/hawkbit-example-ddi-feign-client).
+A small [simulator application](https://github.com/eclipse/hawkbit-examples/tree/master/hawkbit-example-mgmt-simulator) demonstrates how you can interact with the hawkBit via the [Management API
+](http://www.eclipse.org/hawkbit/documentation/interfaces/management-api.html). 
+
+## Example Management API simulator
+
+In the follow code section, you can a see a feign client resource example. The interface extend the origin api interface to declare the `@FeignClient`. The `@FeignClient`declares that a REST client with that interface should be created. 
+
+```Java
+@FeignClient(url = "${hawkbit.url:localhost:8080}/" + MgmtRestConstants.TARGET_V1_REQUEST_MAPPING)
+public interface MgmtTargetClientResource extends MgmtTargetRestApi {
+}
+```
+
+This interface can be autowired and use as a normal java interface:
+
+```Java
+public class CreateStartedRolloutExample {
+
+    @Autowired
+    private MgmtTargetClientResource targetResource;
+
+
+    public void run() {
+        // create ten targets
+        targetResource.createTargets(new TargetBuilder().controllerId("00-FF-AA-0").name("00-FF-AA-0")
+                .description("Targets used for rollout example").buildAsList(10));
+    }
+
+```
+
+At [hawkbit-example-core-feign-client](https://github.com/eclipse/hawkbit-examples/tree/master/hawkbit-example-core-feign-client) is a spring configuration to auto configure some beans, which can be reused for a own feign client.
+
+```Java
+@Configuration
+@ConditionalOnClass(Feign.class)
+@Import(FeignClientsConfiguration.class)
+public class FeignClientConfiguration {
+
+    @Bean
+    public ApplicationJsonRequestHeaderInterceptor jsonHeaderInterceptor() {
+        return new ApplicationJsonRequestHeaderInterceptor();
+    }
+
+    @Bean
+    public Contract feignContract() {
+        return new IgnoreMultipleConsumersProducersSpringMvcContract();
+    }
+}
+
+```