Update lsp.config to invoke dnx from the plugin directory

plugins/dotnet/README.md

@@ -9,11 +9,15 @@ Core .NET and C# skills for coding agents.
 
 ## LSP
 
-This plugin declares a C# LSP server that is launched through the .NET CLI.
+This plugin declares a C# LSP server that is installed through the .NET CLI.
 
 Prerequisites:
-- .NET SDK installed
-- `dotnet` available on PATH
+- .NET 10 SDK installed
+- The `roslyn-language-server` tool installed globally. [Click here](https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-tool-install#global-tools) to learn more about dotnet global tools.
+  ```
+  dotnet tool install --global --prerelease roslyn-language-server
+  ```
+- `roslyn-language-server` available on PATH
 
 ## Skills
 

plugins/dotnet/lsp.json

@@ -1,13 +1,8 @@
 {
   "lspServers": {
     "csharp": {
-      "command": "dotnet",
+      "command": "roslyn-language-server",
       "args": [
-        "dnx",
-        "roslyn-language-server",
-        "--yes",
-        "--prerelease",
-        "--",
         "--stdio",
         "--autoLoadProjects"
       ],
@@ -16,4 +11,4 @@
       }
     }
   }
-}
+}