Revert "Replace DesignKit with package from ElementX."

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

RiotSwiftUI/Modules/Common/Util/MultilineTextField.swift

@@ -56,7 +56,7 @@ struct MultilineTextField: View {
             return theme.colors.accent
         }
         
-        return theme.colors.quaternaryContent
+        return theme.colors.quarterlyContent
     }
     
     private var borderWidth: CGFloat {
@@ -75,7 +75,7 @@ struct MultilineTextField: View {
             .overlay(rect.stroke(borderColor, lineWidth: borderWidth))
             .introspectTextView { textView in
                 textView.textColor = UIColor(textColor)
-                textView.font = .element.callout
+                textView.font = theme.fonts.uiFonts.callout
             }
     }