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>

.gitignore

@@ -11,6 +11,7 @@ target
 .springbeans
 .metadata
 .project
+.idea
 
 # Windows image file caches
 Thumbs.db
@@ -50,8 +51,17 @@ classpath-data.json
 # Eclipse IDE
 *.pydevproject
 
+# Intellij
+*.iml
+
 # Maven
 maven.properties
 
 # Test Files
 *.tmp
+
+# Documentation
+docs/themes/**
+docs/public/**
+docs/content/rest-api/*.html
+.gitmodules