[docs] "Configuration variables" -> "Deploy destinations"

docs/in-depth/deploy-destinations.md

@@ -0,0 +1,46 @@
+# Deploy destination
+
+The `screeps.json` file is a JSON configuration file separated into multiple deploy destinations. We've given you three primary destinations by default.
+
+```json
+{
+  // Used for deploying to the main world
+  "main": {
+    "email": "you@provider.tld",
+    "password": "Password",
+    "protocol": "https",
+    "hostname": "screeps.com",
+    "port": 443,
+    "path": "/",
+    "branch": "main"
+  },
+  // Used for deploying to Simulation mode
+  "sim": {
+    "email": "you@provider.tld",
+    "password": "Password",
+    "protocol": "https",
+    "hostname": "screeps.com",
+    "port": 443,
+    "path": "/",
+    "branch": "sim"
+  },
+  // Used for deploying to a private server
+  "pserver": {
+    "email": "username",
+    "password": "Password",
+    "protocol": "http",
+    "hostname": "1.2.3.4",
+    "port": 21025,
+    "path": "/",
+    "branch": "main"
+  }
+}
+```
+
+You can make as many separate destinations as you want. Just make a copy of any config object and perform the necessary changes. Once you're done, use the `--dest` argument on the `rollup` command to specify which environment to upload to.
+
+```bash
+rollup -c --dest main
+```
+
+Omitting the `--dest` argument will perform a dry run, which can be used for local directories via symlinks.