Less clumsy configuration for desktop and mobile (#553)

* chore: dont use prebuilt builder pattern for configuring desktop

* chore: use regular config pattern for web

* Chore: update docs too

* chore: clean up some warnings

.vscode/settings.json

@@ -1,9 +1,4 @@
 {
-  "rust-analyzer.cargo.allFeatures": true,
-  "rust-analyzer.cargo.features": [
-    "desktop",
-    "router"
-  ],
   "editor.formatOnSave": true,
   "[toml]": {
     "editor.formatOnSave": false