ci: drop support and testing for node 18

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [20.x, 22.x]
 
     steps:
     - uses: actions/checkout@v4

.npmrc

@@ -0,0 +1 @@
+engine-strict=true

README.md

@@ -114,7 +114,7 @@ Puter is available as a hosted service at [**puter.com**](https://puter.com).
 - **Operating Systems:** Linux, macOS, Windows
 - **RAM:** 2GB minimum (4GB recommended)
 - **Disk Space:** 1GB free space
-- **Node.js:** Version 16+ (Version 23+ recommended)
+- **Node.js:** Version 20+ (Version 23+ recommended)
 - **npm:** Latest stable version
 
 <br/>

package.json

@@ -66,5 +66,8 @@
     "sharp": "^0.34.3",
     "sharp-bmp": "^0.1.5",
     "sharp-ico": "^0.1.5"
+  },
+  "engines": {
+    "node": ">=20.0.0"
   }
-}
+}