fluffy.guide: Update development status (#2846)

fluffy/docs/the_fluffy_book/docs/index.md

@@ -19,10 +19,36 @@ To quickly get your Fluffy node up and running, follow the quickstart page:
   - [Quickstart for Docker users](./quick-start-docker.md)
 
 # Development status
-The Portal Network is a project still in research phase.
-This client is thus still experimental.
+The Portal Network is a project still in research phase. This client is thus still experimental.
 
-However, the Portal history, beacon and state sub-networks are already operational and can be tested on the public network or in a local testnet.
+The development of this client is on par with the latest Portal specifications and will continue to evolve according to the Portal specifications.
+
+The Portal history, beacon and state sub-networks are already operational on the public Portal mainnet.
+
+Fluffy is default ran on the [Portal mainnet](https://github.com/ethereum/portal-network-specs/blob/master/bootnodes.md#bootnodes-mainnet) but can also be run on a (local) testnet.
+
+Supported sub-networks and content:
+- [History network](https://github.com/ethereum/portal-network-specs/blob/e8e428c55f34893becfe936fe323608e9937956e/history/history-network.md): headers, blocks, and receipts.
+  - Note: Canonical verification only enabled for pre-merge blocks
+- [State network](https://github.com/ethereum/portal-network-specs/blob/e8e428c55f34893becfe936fe323608e9937956e/state/state-network.md): accounts and contract storage.
+  - Note: The current network does not hold all nor recent state
+- [Beacon network](https://github.com/ethereum/portal-network-specs/blob/e8e428c55f34893becfe936fe323608e9937956e/beacon-chain/beacon-network.md): consensus light client data and historical summaries.
+
+Supported functionality:
+- [Portal JSON-RPC API](https://github.com/ethereum/portal-network-specs/tree/e8e428c55f34893becfe936fe323608e9937956e/jsonrpc)
+- [Consensus light client sync](https://github.com/ethereum/consensus-specs/blob/a09d0c321550c5411557674a981e2b444a1178c0/specs/altair/light-client/light-client.md) through content available on the Portal beacon network.
+- Partial support of [Execution JSON-RPC API](https://github.com/ethereum/execution-apis):
+  - web3_clientVersion
+  - eth_chainId
+  - eth_getBalance
+  - eth_getBlockByHash
+  - eth_getBlockByNumber
+  - eth_getBlockTransactionCountByHash
+  - eth_getCode
+  - eth_getLogs (partial support: queries by blockhash)
+  - eth_getProof
+  - eth_getStorageAt
+  - eth_getTransactionCount
 
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