CSS separation, multi-tenancy fixes

Oqtane.Client/Themes/BlazorTheme/Theme.cs

@@ -0,0 +1,20 @@
+using System.Collections.Generic;
+
+namespace Oqtane.Themes.BlazorTheme
+{
+    public class Theme : ITheme
+    {
+        public Dictionary<string, string> Properties
+        {
+            get
+            {
+                Dictionary<string, string> properties = new Dictionary<string, string>
+                {
+                    { "Name", "Blazor Theme" },
+                    { "Version", "1.0.0" }
+                };
+                return properties;
+            }
+        }
+    }
+}