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/layouts/partials/footer_js.html

@@ -0,0 +1,60 @@
+    <script>
+    {{ with .Scratch.Get "repo_id" }}
+      var base_url = '{{ (printf "%s" $.Site.BaseURL) | safeJS }}';
+      var repo_id  = '{{ . | safeJS }}';
+    {{ else }}
+      var base_url = '';
+      var repo_id  = '';
+    {{ end }}
+    </script>
+
+    <script src="{{ "javascripts/application.js" | absURL }}"></script>
+    {{ range .Site.Params.custom_js }}
+    <script src="{{ . | absURL }}"></script>
+    {{ end }}
+
+    <script>
+      {{ "/* Add headers to scrollspy */" | safeJS }}
+      var headers   = document.getElementsByTagName("h2");
+      var scrollspy = document.getElementById('scrollspy');
+
+      if(scrollspy) {
+          if(headers.length > 0) {
+              for(var i = 0; i < headers.length; i++) {
+                  var li = document.createElement("li");
+                  li.setAttribute("class", "anchor");
+
+                  var a  = document.createElement("a");
+                  if(!headers[i].id)
+                      a.setAttribute("href", headers[i].parentNode.href);
+                  else
+                      a.setAttribute("href", "#" + headers[i].id);
+                  a.setAttribute("title", headers[i].innerHTML);
+                  a.innerHTML = headers[i].innerHTML;
+
+                  li.appendChild(a);
+                  scrollspy.appendChild(li);
+              }
+          } else {
+              scrollspy.parentElement.removeChild(scrollspy)
+          }
+
+
+        {{ "/* Add permanent link next to the headers */" | safeJS }}
+          var headers = document.querySelectorAll("h1, h2, h3, h4, h5, h6");
+
+        for(i = 0; i < headers.length; i++) {
+            var a = document.createElement("a");
+            a.setAttribute("class", "headerlink");
+            a.setAttribute("href", "#" + headers[i].id);
+            a.setAttribute("title", "Permanent link");
+            a.innerHTML = {{ or .Site.Params.permalink "¶" }};
+            headers[i].appendChild(a);
+        }
+      }
+    </script>
+
+    <script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.8.0/highlight.min.js"></script>
+    <script>hljs.initHighlightingOnLoad();</script>
+  </body>
+</html>