Open API specification improvements and License update (#17)

This PR contains the work done to:
* improve the overall `OpenAPI` specification documentation describing the `Amiibo API` service;
* update the `AmiiboFilter` type to include the `head` and `tail` properties;
* update the error handling of the errors coming up from the service;
* update its license to Apache v2.0;
* regenerate the Github Pages documentation.

Reviewed-on: #17
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/image.json

@@ -1 +1 @@
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