Allow hiding API menu items

[NikitaSavik]

As a continuation of https://github.com/blockscout/frontend/issues/1287 lets add the rest of API menu to the option.

• If all items turned off - don't show API root menu item

[isstuev]

it's already possible with the following config NEXT_PUBLIC_NAVIGATION_HIDDEN_LINKS=['eth_rpc_api','rpc_api'] NEXT_PUBLIC_GRAPHIQL_TRANSACTION=none NEXT_PUBLIC_API_SPEC_URL=none