Add node infrastructure guides and restructure section

.ai/pages/nodes-and-validators-run-a-node-bootnode.md → .ai/pages/node-infrastructure-run-a-node-relay-chain-bootnode.md

@@ -2,7 +2,7 @@
 title: Set Up a Bootnode
 description: Learn how to configure and run a bootnode for Polkadot, including P2P, WS, and secure WSS connections with network key management and proxies.
 categories: Infrastructure
-url: https://docs.polkadot.com/nodes-and-validators/run-a-node/bootnode/
+url: https://docs.polkadot.com/node-infrastructure/run-a-node/relay-chain/bootnode/
 ---
 
 # Set Up a Bootnode

.ai/pages/nodes-and-validators-run-a-node-full-node.md → .ai/pages/node-infrastructure-run-a-node-relay-chain-full-node.md

@@ -2,7 +2,7 @@
 title: Set Up a Node
 description: Learn how to install, configure, and run Polkadot nodes, including setting up different node types and connecting to the network.
 categories: Infrastructure
-url: https://docs.polkadot.com/nodes-and-validators/run-a-node/full-node/
+url: https://docs.polkadot.com/node-infrastructure/run-a-node/relay-chain/full-node/
 ---
 
 # Set Up a Node

.ai/pages/nodes-and-validators-run-a-node-secure-wss.md → .ai/pages/node-infrastructure-run-a-node-relay-chain-secure-wss.md

@@ -2,7 +2,7 @@
 title: Set Up Secure WebSocket
 description: Instructions on enabling SSL for your node and setting up a secure WebSocket proxy server using nginx for remote connections.
 categories: Infrastructure
-url: https://docs.polkadot.com/nodes-and-validators/run-a-node/secure-wss/
+url: https://docs.polkadot.com/node-infrastructure/run-a-node/relay-chain/secure-wss/
 ---
 
 # Set Up Secure WebSocket