blazor-components

Describe the bug

![image](https://user-images.githubusercontent.com/25119211/125054605-fc934600-e0d8-11eb

Describe the bug
MudNavGroup Disabled Property does not work as expected

Expected behavior
While using Disabled property in MudNavGroup the NavGroup and the MudNavLink should be disabled.
Note: Disabled property in MudNavLink works fine as expected

TryMudBlazor
https://try.mudblazor.com/snippet/maQvaNvPzcuMPoSl

Screenshots
![image](https://user-images.githubusercon

Perhaps adding a CodeTour would help make it easier for new contributors to find their way around our project.

Let's look at using the CONTRIBUTING doc to make a snazzy CodeTour for future contributors to learn about our project

Depends on #317

Create the VideoPlaylistController with the following methods

• public async Task CreatePlaylist(PlaylistModel playlistModel, CancellationToken cancellationToken)
• public async Task DeletePlaylist(long playlistId, CancellationToken cancellationToken)
  • If the user is not owner of the playlist, throw an exception with the following message: "Unable to delete. You a