[APIM] Changes to Bootstrap your dev environment

[plsstephenson]

The following changes were requested by QA:

1. In the run configuration, we have the title for each config APIM gateway / APIM API etc., but it is not clear that we are talking about gravitee-gateway / gravitee-management-rest-api (i.e it is difficult to link the title with the actual repository)
   Suggestion: We can update title:
   APIM Gateway(gravitee-gateway)
   APIM API(gravitee-management-rest-api)
   APIM Console(gravitee-management-webui)

2. Can we also add a step for importing project/module in the IDE from an existing source as a maven project before creating a run config? it was not clear when I was doing it the first time.