redirect /index.html to root (#8723)
redirect /index.html to root (#8723)

* remove 'index.html' from link endings
rnaveiras/vault,rnaveiras/vault,hartsock/vault,rnaveiras/vault,hashicorp/vault,rnaveiras/vault,hashicorp/vault,rnaveiras/vault,hashicorp/vault,hartsock/vault,hashicorp/vault,hashicorp/vault,hartsock/vault,hartsock/vault,hartsock/vault,hashicorp/vault