Update "How to Use it" section

[FBoucher]

• Update docs to reflect the new version (default without any frontend)
• Default Admin is Azure Storage Explorer, so add a tutorial
• suggest project TinyBlazorAdmin and display a list of all admin.

[FBoucher]

• We need to bring this page https://github.com/FBoucher/AzUrlShortener/tree/main/src/adminTools
  with the media folder
• Create Doc with Azure Storage Explorer

[FBoucher]

All docs are added.