Fix/new architecture

[ignacio-lo-rootstrap]

Associated tickets:

• https://github.com/rootstrap/flutter-base/issues/41
• https://github.com/rootstrap/flutter-base/issues/45
• https://github.com/rootstrap/flutter-base/issues/40

Description:

• New architecture for the base. Previous folders and classes were deleted.

Overall changes:

• New folders and classes to follow the new architecture.

Things to improve:

• HTTP Client used with Dio is not detecting failures such as no internet.
• Resource class can improve the error handling based on changes when we will have a new HTTP Client.