Revert "Replace DesignKit with package from ElementX."

This reverts the following commits:
4858d72afb
6827d2a854
92c5874359
0a9bd1fbe6

DesignKit/Source/ColorValues.swift

@@ -0,0 +1,52 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+import UIKit
+
+/**
+ Struct for holding colour values for a particular theme.
+ */
+public struct ColorValues: Colors {
+    
+    public let accent: UIColor
+    
+    public let alert: UIColor
+    
+    public let primaryContent: UIColor
+    
+    public let secondaryContent: UIColor
+    
+    public let tertiaryContent: UIColor
+    
+    public let quarterlyContent: UIColor
+    
+    public let quinaryContent: UIColor
+    
+    public let separator: UIColor
+    
+    public let system: UIColor
+    
+    public let tile: UIColor
+    
+    public let navigation: UIColor
+    
+    public let background: UIColor
+    
+    public let ems: UIColor
+    
+    public let namesAndAvatars: [UIColor]
+}