docs: Added three third party resources
docs: Added three third party resources

Added my three-part series on django-allauth set and configuration in detail.
pennersr/django-allauth,lukeburden/django-allauth,bittner/django-allauth,rsalmaso/django-allauth,bittner/django-allauth,lukeburden/django-allauth,rsalmaso/django-allauth,rsalmaso/django-allauth,lukeburden/django-allauth,bittner/django-allauth,pennersr/django-allauth,pennersr/django-allauth