ui: move gradient components to their own group

damus/Components/Gradients/AlbyGradient.swift

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+//
+//  AlbyGradient.swift
+//  damus
+//
+//  Created by William Casarin on 2023-05-09.
+//
+
+import SwiftUI
+
+fileprivate let alby_grad_c1 = hex_col(r: 226, g: 168, b: 122)
+fileprivate let alby_grad_c2 = hex_col(r: 249, g: 223, b: 127)
+fileprivate let alby_grad = [alby_grad_c2, alby_grad_c1]
+
+let AlbyGradient: LinearGradient =
+    LinearGradient(colors: alby_grad, startPoint: .bottomLeading, endPoint: .topTrailing)

damus/Components/Gradients/DamusGradient.swift

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+//
+//  DamusGradient.swift
+//  damus
+//
+//  Created by William Casarin on 2023-05-09.
+//
+
+import SwiftUI
+
+fileprivate let damus_grad_c1 = hex_col(r: 0x1c, g: 0x55, b: 0xff)
+fileprivate let damus_grad_c2 = hex_col(r: 0x7f, g: 0x35, b: 0xab)
+fileprivate let damus_grad_c3 = hex_col(r: 0xff, g: 0x0b, b: 0xd6)
+fileprivate let damus_grad = [damus_grad_c1, damus_grad_c2, damus_grad_c3]
+
+struct DamusGradient: View {
+    var body: some View {
+        LinearGradient(colors: damus_grad, startPoint: .bottomLeading, endPoint: .topTrailing)
+            .edgesIgnoringSafeArea([.top,.bottom])
+    }
+}
+
+struct DamusGradient_Previews: PreviewProvider {
+    static var previews: some View {
+        DamusGradient()
+    }
+}