Update contributing.mdx

Correcting the command to start angular server to `npm run start`

pages/contributing.mdx

@@ -16,8 +16,8 @@ We're always looking for people to help make Kavita even better, there are sever
 - HTML/Javascript editor of choice (VS Code/Sublime Text/Webstorm/Atom/Notepad++/etc)
 - Git style tool like [Git](https://git-scm.com/downloads) or [Github Desktop](https://desktop.github.com/)
 - [NodeJS](https://nodejs.org/en/download/) (Node 18.13.X or higher)
-- Latest .NET version (8.0.2 as of the time of writing)
-- dotnet tool install -g --version 6.5.0 Swashbuckle.AspNetCore.Cli
+- .NET 8.0+
+- dotnet tool install -g Swashbuckle.AspNetCore.Cli
 
 ### Getting started
 
@@ -31,7 +31,7 @@ npm install
 npm install -g @angular/cli
 ```
 
-4. Start angular server `ng serve`
+4. Start angular server `npm run start`
 5. Build the project in Visual Studio/Rider, Setting the startup project to `API`
 6. Debug the project in Visual Studio/Rider
 7. Open http://localhost:4200
@@ -67,4 +67,4 @@ If you just want to play with Swagger, you can just
 - dotnet run -c Debug
 - Go to http://localhost:5000/swagger/index.html
 
-If you have any questions about any of this, please let us know.
+If you have any questions about any of this, please let us know.