Manage user accounts

[agrant3d]

https://github.com/mtlpy/mtlpy-django-abandoned/issues/5

• Change the admin password
• Create 2 groups:
  • "authors" people that will have access to adding and editing blog posts
  • "members" people that will have the same rights as authors and will also appear on the web site.
• Assign the correct role to the existing users and create any missing users.
• Set the accounts as inactive. And activate them once they are ready to write a blog.