Some package and library documentation updates (#13)

This PR contains the work done to:
* Updated the library *DocC* documentation catalog;
* Updated the library documentation for both *Xcode* and *GitHub Pages*;
* Added the Swift version and compatibility badges to the README file;
* Added the link to the *GitHub Pages* documentation in the *Swift Package Index* configuration.

Reviewed-on: #13
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

docs/data/documentation/amiiboservice/amiibo/release-swift.struct/america.json

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