Update README

README.md

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 # jelly-protobuf
+
 Protocol Buffers and gRPC specifications for the Jelly protocol.
 
 - `rdf.proto` – the RDF Protocol Buffers serialization only. Use this if you don't plan on using Jelly's gRPC protocol.
 - `grpc.proto` – Jelly's gRPC protocol service specifications.
 
+**[See the protocol specification on the website](https://jelly-rdf.github.io/latest/specification/)**
+
+**[More information about Jelly](https://jelly-rdf.github.io/latest/)**
+
 ## Usage
-The protocol is not stable yet and will change. Expect a first stable release in Q1 2023.
+
+The protocol is not stable yet and may change before the initial (1.0.0) release. Expect a first stable release in Q4 2023.
+
+The `rdf.proto` and `grpc.proto` files define the Jelly RDF serialization and the gRPC pub/sub service, respectively. They use the [proto 3](https://protobuf.dev/programming-guides/proto3/) language and can be used with protoc or any other compatible tool. See the [Protocol Buffers documentation](https://protobuf.dev/) for more details.
 
 ## Versioning
+
 This protocol follows the [Semantic Versioning 2.0 scheme](https://semver.org/). The current major version is 1, and after it stabilizes, backward compatibility with it will be kept in future 1.x.y versions.
 
 ### Releases
+
 The `dev` release tag corresponds to the main branch in the repository and is updated automatically.
 
 Tagged (versioned) releases are created manually. To create a new tagged release (example for version 1.2.3):