[FEATURE REQUEST] Update documentation after v2 paper is published

**Is your feature request related to a problem? Please describe.**
By the time the CityLearn v2 paper is published, the text in the CityLearn website will be dated.

**Describe the solution you'd like**
Use v2 paper to update content at [citylearn.net](https://www.citylearn.net)

**Describe alternatives you've considered**
NIL

**Additional context**
NIL
