Remove $ char from pw generation

[etj]

$ char in the .env file confuses docker that will use it as part of a variable.
In order to escape $ in the .env file it should be doubled ($$), but this is reported not working in many situations.

Quick solution would be to avoid generating dollar signs when creating passwords, by removing it in this line:

geonode/create-envfile.py

Line 48 in 7ef2e13

string.ascii_letters + string.digits + string.punctuation.replace('"', "").replace("'", "").replace("`", "")