PostIt: fix blog API double-prefix; drop redundant New

BlogApiClient's "api/blog" path combined with the BaseAddress's
"api/v1/" prefix to produce 404s on every call. Drop the redundant
"api/" segment, let Save handle the create case (no selection) and
remove the now-redundant New button + command.

src/Yavsc.Blogs/Controllers/BlogApiController.cs

@@ -10,7 +10,6 @@ namespace Yavsc.Blogs.Controllers
     [Authorize("BlogScope")]
     [Produces("application/json")]
     [Route(APIPrefix + "/blog")]
-
     public class BlogApiController : Controller
     {
         private readonly BlogSpotService blogSpotService;