update api reference for v9.1.0 and improve v3 migration docs

content/docs/en/apis/stacks-blockchain-api/reference/info/meta.json

@@ -1,10 +1,5 @@
 {
   "title": "Info",
-  "pages": [
-    "status",
-    "network-block-time",
-    "network-given-block-time",
-    "total-and-unlocked-stx-supply"
-  ],
+  "pages": ["status"],
   "defaultOpen": false
 }

content/docs/en/apis/stacks-blockchain-api/reference/smart-contracts/get-smart-contract.mdx

@@ -0,0 +1,12 @@
+---
+title: Get smart contract
+sidebarTitle: Smart contract
+description: Retrieves a deployed smart contract, along with the transaction that deployed it. Only successfully deployed contracts are returned; a contract id whose deploy transaction failed is not found.
+full: true
+---
+
+<APIPage
+  document="./openapi/stacks-blockchain-api.json"
+  operations={[{ path: '/extended/v3/smart-contracts/{contract_id}', method: 'get' }]}
+  hasHead={false}
+/>

content/docs/en/apis/stacks-blockchain-api/reference/smart-contracts/meta.json

@@ -1,10 +1,5 @@
 {
   "title": "Smart Contracts",
-  "pages": [
-    "status",
-    "info",
-    "by-trait",
-    "get-smart-contract-logs"
-  ],
+  "pages": ["status", "get-smart-contract", "get-smart-contract-logs"],
   "defaultOpen": false
 }

content/docs/en/apis/stacks-blockchain-api/reference/staking/get-cycle-signers.mdx

@@ -0,0 +1,12 @@
+---
+title: Get cycle signers
+sidebarTitle: Cycle signers
+description: "Get the signer set of a PoX cycle, including each signer's weight, staked amount, and the signer manager contracts whose registered signing key (via `register-signer`) was this key when the cycle's reward set was calculated. Each manager also lists its live `grant-signer-key` authorizations, and keys registered after the reward set was calculated are surfaced as pending updates that take effect next cycle."
+full: true
+---
+
+<APIPage
+  document="./openapi/stacks-blockchain-api.json"
+  operations={[{ path: '/extended/v3/staking/cycles/{cycle_number}/signers', method: 'get' }]}
+  hasHead={false}
+/>

content/docs/en/apis/stacks-blockchain-api/reference/staking/meta.json

@@ -9,6 +9,7 @@
     "get-bond-allowlist-entry",
     "get-bond-registrations",
     "get-bond-registration",
+    "get-cycle-signers",
     "get-staking-signers",
     "get-staking-signer",
     "get-staking-signer-stakers"

content/docs/en/apis/stacks-blockchain-api/reference/tokens/get-ft-total-supply.mdx

@@ -0,0 +1,12 @@
+---
+title: Get total fungible token supply
+sidebarTitle: Total fungible token supply
+description: "Retrieves the total supply of a fungible token: the sum of every holder balance, equivalent to the token's mints minus its burns. Returns a zero supply for a token with no recorded balances."
+full: true
+---
+
+<APIPage
+  document="./openapi/stacks-blockchain-api.json"
+  operations={[{ path: '/extended/v3/tokens/ft/{asset_identifier}/supply', method: 'get' }]}
+  hasHead={false}
+/>