Review articles in the package site

[rafalopespx]

To guarantee a well written documentation and understandable articles, we have to review the articles presented in the site of the package:

• [x] Get started!
• [x] Forecasting
• [x] Nowcasting for decision-making
• [x] Structured data

[rafalopespx]

Articles revised for the release and merge to add teh zero-inflated models