ToDo's for the documentation

[uvchik]

• Add a paragraph about the limitations of the standardised load profiles
• Fill usage section of the BDEW heat profiles
• Add details for the types of electrical profiles -> PR Improve docs of demandlib #44
• ...

Please add ToDo's for the documentation here.

[maurerle]

It would be very helpful to also provide some of the content here:
https://github.com/oemof/demandlib/blob/dev/examples/electricity_demand_example.py
on the readthedocs page :)

Furthermore the content in the examples file seems to be outdated as there is no profile for i0, i1, i2

demandlib/examples/electricity_demand_example.py

Lines 52 to 54 in 5cb5784

	"i0": 3000,
	"i1": 5000,
	"i2": 6000,

The documentation states, that g7 is also available, but I do not get data when requesting G7 as a loadprofile :)