add mtc controller docs

Author: yungwine

docs/v3/guidelines/nodes/maintenance-guidelines/mytonctrl-remote-controller.md

@@ -0,0 +1,74 @@
+# MyTonCtrl Remote Controller
+
+MyTonCtrl and TON Node can be used on separate machines. There are some advantages of using that:
+
+* To participate in elections, the validator wallet's private key is required by MyTonCtrl. If the Node server 
+is compromised, it could lead to unauthorized access to the wallet funds. As a security measure, MyTonCtrl can be hosted on a separate server.
+* MyTonCtrl continually expands its functionality, which may consume resources crucial for the Node.
+* Probably in future big validators will be able to host several instances of MyTonCtrl controlling several nodes on one server.  
+
+## Setting up
+
+Prepare 2 servers: one is for running TON Node that meets the requirements and one is for running MyTonCtrl which does not require a lot of resources.
+
+1. Node server:
+
+Install MyTonCtrl in `only-node` mode:
+
+```
+wget https://raw.githubusercontent.com/ton-blockchain/mytonctrl/master/scripts/install.sh
+sudo bash install.sh -m validator -l
+```
+
+It will install TON Node and create a backup file which you need to download and transfer to the Controller server:
+
+```log
+...
+[debug]   01.01.2025, 00:00:00.000 (UTC)  <MainThread>  start CreateSymlinks fuction
+Local DB path: /home/user/.local/share/mytoncore/mytoncore.db
+[info]    01.01.2025, 00:00:00.000 (UTC)  <MainThread>  start ConfigureOnlyNode function
+[1/2] Copied files to /tmp/mytoncore/backupv2
+[2/2] Backup successfully created in mytonctrl_backup_hostname_timestamp.tar.gz!
+If you wish to use archive package to migrate node to different machine please make sure to stop validator and mytoncore on donor (this) host prior to migration.
+[info]    01.01.2025, 00:00:00.000 (UTC)  <MainThread>  Backup successfully created. Use this file on the controller server with `--only-mtc` flag on installation.
+[debug]   01.01.2025, 00:00:00.000 (UTC)  <MainThread>  Start/restart mytoncore service
+[debug]   01.01.2025, 00:00:00.000 (UTC)  <MainThread>  sleep 1 sec
+[5/5] Mytonctrl installation completed
+```
+
+Note, that you still got access to MyTonCtrl console on this server, which you need to update the Node, watch Node metrics, etc.
+Also, it creates a `mytoncore` service which is used to send telemetry (if it was not disabled). 
+If you want to return control of the node to this server, use command
+
+```bash
+MyTonCtrl> set onlyNode false
+systemctl restart mytoncore
+```
+
+2. Controller server
+
+Install MyTonCtrl in `only-mtc` mode:
+
+```
+wget https://raw.githubusercontent.com/ton-blockchain/mytonctrl/master/scripts/install.sh
+sudo bash install.sh -p /home/user/mytonctrl_backup_hostname_timestamp.tar.gz -o
+```
+
+Check the `status` command, there should appear `Node IP address` field:
+
+```log
+MyTonCtrl> status
+[debug]   01.01.2025, 00:00:00.000 (UTC)  <MainThread>  start GetValidatorWallet function
+[debug]   01.01.2025, 00:00:00.000 (UTC)  <MainThread>  start GetLocalWallet function
+[debug]   01.01.2025, 00:00:00.000 (UTC)  <MainThread>  start GetWalletFromFile function
+[debug]   01.01.2025, 00:00:00.000 (UTC)  <MainThread>  start WalletVersion2Wallet function
+[debug]   01.01.2025, 00:00:00.000 (UTC)  <MainThread>  start GetDbSize function
+===[ Node status ]===
+Node IP address: 0.0.0.0
+Validator index: n/a
+...
+```
+
+## Notes
+
+On updates, you need to `update` and `upgrade` both Node server and Controller server

sidebars/guidelines.js

@@ -232,6 +232,7 @@ module.exports = [
       'v3/guidelines/nodes/maintenance-guidelines/mytonctrl-backup-restore',
       'v3/guidelines/nodes/maintenance-guidelines/mytonctrl-validator-standby',
       'v3/guidelines/nodes/maintenance-guidelines/mytonctrl-prometheus',
+      'v3/guidelines/nodes/maintenance-guidelines/mytonctrl-remote-controller'
     ],
   },
   'v3/guidelines/nodes/custom-overlays',