[#1609] config: Remove mainchain section

It is deprecated and unused, there is no need to have it in the
documentation.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

config/example/node.env

@@ -58,10 +58,6 @@ NEOFS_MORPH_DIAL_TIMEOUT=30s
 NEOFS_MORPH_DISABLE_CACHE=true
 NEOFS_MORPH_RPC_ENDPOINT="wss://rpc1.morph.fs.neo.org:40341/ws wss://rpc2.morph.fs.neo.org:40341/ws"
 
-# Main chain section (optional)
-NEOFS_MAINCHAIN_DIAL_TIMEOUT=30s
-NEOFS_MAINCHAIN_RPC_ENDPOINT="https://rpc1.n3.nspcc.ru:30341 https://rpc2.n3.nspcc.ru:30341"
-
 # API Client section
 NEOFS_APICLIENT_DIAL_TIMEOUT=15s
 

config/example/node.json

@@ -99,13 +99,6 @@
       "wss://rpc2.morph.fs.neo.org:40341/ws"
     ]
   },
-  "mainchain": {
-    "dial_timeout": "30s",
-    "rpc_endpoint": [
-      "https://rpc1.n3.nspcc.ru:30341",
-      "https://rpc2.n3.nspcc.ru:30341"
-    ]
-  },
   "apiclient": {
     "dial_timeout": "15s"
   },

config/example/node.yaml

@@ -85,12 +85,6 @@ morph:
     - wss://rpc1.morph.fs.neo.org:40341/ws
     - wss://rpc2.morph.fs.neo.org:40341/ws
 
-mainchain:  # DEPRECATED section, is not used and not read
-  dial_timeout: 30s  # timeout for main chain NEO RPC client connection
-  rpc_endpoint:  # main chain NEO RPC endpoints; are shuffled and used one by one until the first success
-    - https://rpc1.n3.nspcc.ru:30341
-    - https://rpc2.n3.nspcc.ru:30341
-
 apiclient:
   dial_timeout: 15s  # timeout for NEOFS API client connection