All BESSER apps use same default ports

[mgv99]

All apps use same default ports (8000), graphical editor, backend and django. This leads to execution issues when running multiple things simultaneously (e.g. BESSER modeling editor + backend + django). In django generator docs, it is not explained how to change the port in the dockerfile (since there are 2 (8000:8000) some people may not know how to change it). In the backend, you have to change it in the main file. Not explained either.

[ademait]

I opened an issue at the same time reporting the same behavior: #218 . I closed it, but could be relevant to see expected behavior.