Add cardano-node, cardano-rpc and BlockPQR to the ecosystem pages

[carbolymer]

This PR adds three entries to the ecosystem pages:

• Servers: cardano-node's built-in gRPC interface, implemented by the cardano-rpc Haskell package developed by IntersectMBO.
  Sync and Query are supported today, Submit and Watch are in development.
  The entry links to the per-method spec coverage table in the package README.
• Clients: the cardano-rpc Haskell client modules, which work against any server implementing the spec.
• Teams: a card for BlockPQR. cardano-rpc is being developed by BlockPQR now - press release.

[olgahryniuk]

Suggested minor edits

[carbolymer]

I'm unsure what exactly 🛠️ and ✅ means here so I followed the convention that if the main methods are implemented in cardano-rpc, it's marked with ✅:

• Sync ✅: FetchBlock, FollowTip, ReadTip work - you can follow the chain end to end. Only DumpHistory (bulk history) is missing.
• Query ✅: ReadParams, ReadUtxos, SearchUtxos, ReadGenesis, ReadEraSummary work. Of the three missing, ReadData and ReadTx are permanently out of scope (they need a chain indexer the node will never
  keep). Query can technically never reach 100% ✅. Only ReadState is genuinely pending.
• Submit 🛠️: SubmitTx and EvalTx work, but WaitForTx, ReadMempool, WatchMempool don't - you can submit, but not track a transaction, which is half the module's purpose.
• Watch 🛠️: zero methods implemented.