chore: rewrite readme and taglines for plugin-based termix

package.json

@@ -5,7 +5,7 @@
     "packages/*"
   ],
   "version": "26.10.0",
-  "description": "Self-hosted SSH and remote desktop management.",
+  "description": "Self-hosted, plugin-based server management.",
   "author": "Karmaa",
   "main": "electron/main.cjs",
   "engines": {