docs: fix README missing and duplicated links (#2048)

README.md

@@ -26,7 +26,6 @@
 - [Oracles](#oracles)
 - [Channels](#channels)
 - [AEX9 tokens](#aex9-tokens)
-- [AEX9 contract balances](#aex9-contract-balances)
 - [NFTs](#aex141)
 - [Statistics](#statistics)
 - [Activities](#activities)
@@ -43,6 +42,11 @@ The middleware is a caching and reporting layer which sits in front of the nodes
 
 The architecture of the app is explained [here](docs/architecture.md).
 
+## Prerequisites
+
+For running it without Docker, ensure that you have [Elixir 1.17](https://elixir-lang.org/install.html) installed, using Erlang 26 or newer.
+
+If using Docker, make sure you have [Docker 27](https://docs.docker.com/engine/install/) or newer.
 
 ## Setup
 
@@ -2639,8 +2643,31 @@ $ curl -s "https://mainnet.aeternity.io/mdw/v3/oracles?state=active&limit=1" | j
 }
 ```
 
+### `/v3/oracles/:id`
+
+```
+$ curl -s "https://mainnet.aeternity.io/mdw/v3/oracles/ok_R7cQfVN15F5ek1wBSYaMRjW2XbMRKx7VDQQmbtwxspjZQvmPM" | jq '.'
+{
+  "active": false,
+  "active_from": 4660,
+  "expire_height": 6894,
+  "approximate_expire_time": 1544587118827,
+  "register_time": 1544194831238,
+  "register_tx_hash": "th_2SLFNYk5s5u5tRD4Bqx6pSc1mysZMsCr3szbx55nKgVBQSiZv2",
+  "format": {
+    "query": "string",
+    "response": "string"
+  },
+  "oracle": "ok_R7cQfVN15F5ek1wBSYaMRjW2XbMRKx7VDQQmbtwxspjZQvmPM",
+  "query_fee": 20000,
+  "register": 11023
+}
+```
+
 ### `/v3/oracles/:id/queries`
 
+Paginated list of an oracle's queries.
+
 ```
 $ curl -s "https://mainnet.aeternity.io/mdw/v3/oracles/ok_R7cQfVN15F5ek1wBSYaMRjW2XbMRKx7VDQQmbtwxspjZQvmPM/queries" | jq '.'
 {
@@ -3259,7 +3286,7 @@ $ curl -s 'https://testnet.aeternity.io/mdw/v3/aex141/transfers?to=ak_QVSUoGrJ31
 
 ---
 
-## Stats
+## Statistics
 
 ### `/v3/stats/delta`