refactor(docs): index: change where to find machine setup

docs/index.md

@@ -29,7 +29,6 @@ Following is a list, what each site contains:
  - __Changelog:__ auto-generated changelog from the commits
  - __Contributing:__
      - Prerequisites to be able to be a contributor to this project
-     - Needed machine-setup to develop (both for the library and documentation part)
  - __License:__ GNU GPLv3 content
  - __Usage:__
      - needed entries to get this library into your own maven-project
@@ -39,7 +38,7 @@ The __API__ part holds a detailed description, for each publicly accessible clas
 There is an own index file, explaining the package structure of the library
 and how it is documented.
 
-The __Developers Guide__ is the part, you have to lookup the conventions and workflows used in this project,
+The __Developers Guide__ is the part, you have to lookup how to setup your machine and conventions and workflows used in this project,
 if you decide to contribute to it.
 
 ## Maintainer