Drop grpc-web for all interfaces

[altafan]

At the moment the daemon can be reached with grpc, grpc-web but also via rest thanks to grpc-gateway and google api annotations. grpc-web and rest basically overlap (even though they are not so similar technically) so we can safely drop one of the 2.

Let's drop grpc-web in favor of grpc-gateway. This means adding api annotations to the daemon protos.