Fix documentation

[RobyFerro]

Documentation is quite old. Needs update with new features and architecture description.

[RobyFerro]

Fix routing, config and installation chapters. With the latest version I've removed the config.yml and routing.yml files.
This completely change how Go-Web have to be configured.

[RobyFerro]

Due to the last updates we need to update even the request validation chapter.