domain mapping service and more cleanup

src/Icons/Services/DomainMappingService.cs

@@ -0,0 +1,24 @@
+using System.Collections.Generic;
+
+namespace Bit.Icons.Services
+{
+    public class DomainMappingService : IDomainMappingService
+    {
+        private readonly Dictionary<string, string> _map = new Dictionary<string, string>
+        {
+            ["vault.bitwarden.com"] = "bitwarden.com",
+            ["accounts.google.com"] = "google.com",
+            // TODO: Add others here
+        };
+
+        public string MapDomain(string hostname)
+        {
+            if(_map.ContainsKey(hostname))
+            {
+                return _map[hostname];
+            }
+
+            return hostname;
+        }
+    }
+}