update local installation guide for version 2.0

[stefanlack]

Local installation guide has to be updated to reflect changes done in 2.0:

Hint: Local installation guide is located in this path: https://github.com/opendevstack/opendevstack.github.io/tree/master/docs/modules/local-install

Let's summarize changes done in verison 2.0:

• new Repository ods-quickstarters (replacement of ods-project-quickstarters)

[stefanlack]

@michaelsauter @ungerts @kiwo @clemensutschig @tjaeschke

• can you all please help and provide additional information about what was changed for 2.0?