Open API and documentation improvements (#20)

This PR contains the work done to polish the `Open API` specification document as well as the `DocC` documentation even further, by removing unnecessary intermediate types and adding missing documentation.

Reviewed-on: #20
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/gamecharacter.json

@@ -1 +1 @@
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