Simplify cli-config, hotreload -> devtools (drop to 0 deps, fast compile times) (#2975)

* simplify cli-config crate
* clean up configs
* add devtools crate, update cargo imports
* fix serve addr, fix websocket proxy issue
* add comment about opt profiles
* rename hot-reload to devtools

packages/rsx/.vscode/settings.json

@@ -1,8 +1,4 @@
 {
     "rust-analyzer.check.workspace": false,
-    // "rust-analyzer.check.extraArgs": [
-    //     "--features",
-    //     "hot_reload"
-    // ],
     "rust-analyzer.cargo.features": "all"
 }